I here where your coming from, but here's the deal. I was the first person on this board to get the BX500 and it's worked absolutely flawless for me as did Carvin's BX1200 for 2 yrs before I bought the BX500. It's been mentioned here so many times, I'll say once more, you get a 10 day free trial period if for any reason you don't like the head return it, the most it should cost you is 20 bucks if that.
You here about all the heads that got returned, but your not hearing about all the heads that haven't been returned. Sure it had some gliches early on, but Carvin has worked those out. Give their product a shot and you make the call whether or not you want it or not - your in charge for 10 days.