Here is a list of all the PES toys I have or have used, both on myself and others.
These are just MY experiences and those of my subs. Your experience may be totally different.
Again, If you have any thoughts on these toys or know if things are compatible please let me know.
For more info see my Folsom Vs PES toys under: Help!! Which one do I buy?

Unless otherwise noted, toys have been tested with one or more of the following:
PES, a tens unit (low power), a relaxacisor & the Eros Tek ET-312

BUTT PLUGS: I do not have any of the PES butt plugs. I did not know of their existence until after I bought the Folsom ones. I do like that they have the to option of a soft flexible butt plug (for those of us with virgin or just tight holes) or a hard (and supposedly more intense) for those of us with tight holes. I probably would have gotten one of those had I know about them. I don't think the Folsom plugs are bad at all, just a little on the big side. Tip: make sure not to buy a plug that is too big, it doesn't do any good if you can't get it or tolerate its fullness once it's there.

ANAL TUBULAR ELECTRODE: This is only half the price of the but plug and is unipolar. I thought it would be great for public play because it doesn't have the bulk of the but plug and could be worn for many hours without discomfort. I also though it would be a great alternative for my subs who can take much anally, but still want to try some sensation there. However, I am very disappointed with it. Even using the Eros-Tek ET-312 on on maximum power the sensation is VERY weak. It doesn't come anywhere close to the sensation of a but plug. Because it is unipolar you must use it with another unipolar or bipolar (y adapter needed) toy. I tried it with several different toys including the PES hand / vaginal shield and a relaxacisor pad. On both the other toy (hand shield or pad) were very strong and painful, while I felt only a slight tingle in my ass. They say to connect it with just one side of a bipolar toy (like the shield or vaginal plug). However, I don't recommend this. I tried it that way and it hurt like hell, as all the electricity is focuses on one side. PES does not sell or even mention using a Y connector. I did try using a Y connector with adapters and it doesn't help much. I really feel that PES company really misleads its female customers when it says they can use it.

HAND / VAGINAL SHIELD: This is good toy that produces a nice pulling like sensation - though not as intense I would like. I had my Eros-Tek unit set on Max power and then all the way to 100 and still felt like I wanted a bit more. I tried it with the PES box and feel almost nothing. I used in on my cunt lips and it definitely got me excited, though not nearly enough to cum from. It could be very frustrating for a female sub wanting to cum. However, it does not stay on very well. The straps are awful, whoever designed them was an idiot. They are made of rubber and won't stay tied. You pretty much have to tie them tight and not move at all to get it to stay put. I though this might be good for "under the clothes" public play (with a portable box like a tens unit), but because the strap is so crappy, I don't think it will work. I have though of getting better, more conforming elastic strap or putting on really tight panties, but I don't know if it will work.

COCKHEAD STIMULATOR: The carry three styles: a basic one, one with stimulating pods and one with a urethral adapter built in. I have used the urethral one. My sub liked it and it was easy to use. I would be good for those new to urethral electric play. One of my subs created a homemade version of the urethral one. It isn't as pretty, but it functions just the same. It is very intense (pain) and he loves it. It may be more erotic when used with the actual PES box.

ELECTRO-FLEX PENIS BAND: PES makes flexible bands to wrap around the cock, serving the same function, that come in many sizes in both uni-polar or bipolar styles. I don't have this, but because it's flexible and gives a bit more leeway for penis size, I feel it's probably better than the Folsom cock ring. One of my subs bought the Folsom cockring and it doesn't fit him perfectly so it doesn't make good contact. From a safety standpoint, I don't like hard inflexible cock rings. If the cock becomes engorged they could be difficult the get off.

SCROTUM ELECTRODE: I use these quite a bit and they are unipolar. I like that they are cheap (about $35 a piece) and adjustable to different sizes. You can always adjust up or down while keeping the electrode one. There are similar ones sold by other companies such as Sextek

SPARKLER: Folsom makes these too. My sub was very disappointed in this. He felt the cockhead stimulator (homemade version) was much better. This is meant for urethral play. I like non-electrial sounds for this better as they are more versatile. I like the flat ended ones sold by The Stockroom.