I've used the 901 / 510 / 4081 / 801 / BE112 / & 401. I really never had a bad one in any of those Models. It's really amatter of personal prefrence. I'm down to the 4081 and 510 now, and like them both.
You'll be happy with your new 510. I suggest you look into a nice battery mod now. See about something in a 901 mod, and pickup a couple of 901 to 510 adapters so you can use both types of attys with the mod.
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