I purchased the Lelo Smart Wand because I love quality and I love rechargeable toys but as a back massager there are certain spots I just need more strength for. I'm thinking about getting the hitachi but I hate how heavy it is, the porous material, and the fact its not waterproof. I know I can't have everything though. I have a really bad back and I use my lelo smart wand so much that waiting for 2 hours for it to charge can be a drag and like I stated above there are certain spots I just need something a little stronger for bc the spots I need it for are deep and hard to get to. Is there anything comparable in strength that has better features?