Best purchase of the year, and last year as well! I have use a Tens7000 unit for about 5 years and had an HFO about 3 times. I’ve had the 2B for about a month and have had 7 in maybe 10 sessions. I love the ability to connect to my computer and the huge number of available files. So far I am not liking most of the built in files on the 2B, just deliver pain to me, so I use continuous mode to warm me up, then I’m off to the files I’ve downloaded or the Milovana Estim stories. I should throw 90 % of my other toys away, and keep the Tens for actual therapeutic use!