The BLX90 (and its various incarnations) is one of the all time great racquets. It just feels superb in terms of the way it swings, its solidity, its plow, its precision, its feel, its targeting etc. It's a God stick.
The problem is, you have to be God like to use it. Fine at lower levels, where the players you meet, and the balls you get, aren't going to be anything to trouble you, but as you go up the levels, you'll find that 90sq" a disadvantage.