I've mentioned this electrode in another thread, but haven't yet relayed my experience after obtaining an ET232: http://www.happystim-usa.com/catalog/i677.html. I previously had pleasurable experiences connected to a TENS 7000, but the prostate stimulation was never as intense as through other methods and I never had an ejaculatory orgasm when used in conjunction with another electrode or electrodes. Paired with a proper powerbox, this is my favorite electrode I own. I also have the Zeus bipolar urethral sound, which is enjoyable but it provides less direct prostate stimulation due to its length and rigidity. The length and flexibility of the sound from Happystim is near perfect for my individual anatomy, such that inserting the sound about a half inch beyond the second connection bumps hits my p-spot sweet spot. I'm a little above average length, so I'm impressed how the design can target the average male e-stimmer. Since a bit of non-conductive material is inserted, the interior side of my glans receives variable stimulation depending on how erect I am.
As I've learned the ET232 settings better, I've learned that the Throb, Thrust and Intense modes drive this probe to providing multiple prostate orgasms, the latter two modes being the best, especially with the MA set halfway to full blast. The Intense mode felt like an internal jackhammer on my prostate, which feels WAY better than that may sound to some. I find I only need to reapply lube at the tip of my cock since the prostate fluid stimulated to be released is copious. The probe slides out with no sensation of the bumps due to being coated with precum that leaks long after I'm done.
If you can comfortably insert at least a 7mm sound without warm-up and like e-stim, you should consider this electrode. I'd love to hear other members experiences or pairings with other electrodes (specifically pertaining to anal ghost fucking for rectal p-spot stimulation). I'm looking to pair this sound with a bipolar anal probe or plug that with massage my prostate from the other side via ghost fucking. My Zeus bipolar probe, bipolar plug and bipolar prostate stimulator don't target my prostate rectally the way I'd like. The former too primarily cause rectal muscle contractions, but they don't touch the sphincters. It looks like I need a plug with either two rings (one at the sphincters) or two vertical strips that extend outside the sphincters. That would likely be either a stainless steel plug or an acrylic PES plug.
EDIT: For those interested in bladder play, I've had this probe slip into my bladder on a couple of occasions due to the stimulation that must have relaxed the sphincter. Luckily I had towels down to absorb the urine since I always sound with a partially full or full bladder.