This electrode is definitely worth purchasing! I’ll probably be writing more about it as I experiment with all the options that are available. I would have written sooner but I I got greedy and decided to go from the red collection 1.5 diameter to a 2.0 inch triple. For me it was quite a process achieving a fit and took numerous sessions to insert. The initial feedback was so different than the bi-polar electrode. Using three points of contact and the fourth on my testicles was extremely pleasing and made the hard rhythm mode a challenge as it pounded me. Waterfall wasn’t bad either. Can’t wait to express more on this great product.