I used to use the Masters Edition one, was a very good driver, although I thought the Amp Cell before it and the Fly Z after it were slightly better. Still a very good driver though and could probably be had now at a very cheap price. I have an immaculate orange Fly Z with regular shaft I could let go if interested.
I've been using a Bio Cell driver for the last few years. Its quite forgiving and the distance was as good as anything else that I tried.
Back to Back winner of HFH Longest drive:thup: (Actually it would have 3 last year but my ball ran past and came to rest just off the fairway ).
Bio Cell gets my vote but I fancy a change this year and have been looking at the M2 driver. I love the 3W and I have heard good things about the driver - just waiting for the prices to fall a bit.