Dima Prok
This thing is as good as original one that I paid $100+ and it died on me after number of years, at least if this dies, I only out $16 bucks, highly recommend it.  The only con I found was; the battery seal is not perfect and allows moisture to get in and after months I've noticed tiny rust spots developed on the plus side of my Eneloop rechargeable batteries.  I added silicon lube around the o-ring of the cap, going to stick to one set of rechargeable batteries in case the rusting gets worse.  I still think it's a lot cheaper to replace my rechargeable batteries IF they do go out, which I don't think it's going to happen anytime soon, than to replace the whole brush when internal battery goes out.  I got this on sale ($16) with free shipping, I plan to order more when I see it on sale again.
Rating: 5 stars