There actually have been quite a few threads on this subject in the past. Here is one from about 1.5 years ago:
http://tt.tennis-warehouse.com/showthread.php?t=62579&highlight=Warrior
I used to use the Bandit OS, modified with additional lead at the 3 and 9 positions. I could hit very heavy groundstrokes with that frame, but for me, it lacked feel... particularly at the net, or if you were trying to hit a pinpoint serve. Also, although the racquet is very light overall, the balance is very head heavy (and even heavier with the lead I added) and it has a high swing weight. This meant that the manuverability suffered on fast exchanges. And finally, as others have mentioned, the Bandit OS has a very open string pattern, which eats strings fast.
At the end of last year, I went on a business trip to California. While I was there, a friend wanted to play tennis, and I borrowed one of his Warriors to hit. To my surprise, the frame was very manuverable, had amazing feel, and fit my game very well. When I returned, I ended up buying 6 of the frames off of TW (at $69, you can buy more of them and still pay less than a couple O3 models). I have been very happy with this racquet, and have been playing with it in it's stock form. Recently, I have been considering the idea of adding some lead to the head, which may hurt the manuverability a bit, but increase the power and stability when I'm playing against harder hitting 4.5 or 5.0 players.
Also, this may not be relative, but I was practicing with my USTA league team a couple weeks ago when one of my buddies broke the strings on all three of his Wilson nPro frames. I let him borrow one of my Warriors, and for the next three sets, I could see and feel more spin and power on his serve and groundies, better returns, and crisper volleys. His nPros are MP, while my Warriors are OS, so that could have been the difference... but it certainly had him wondering.
Bottom line, I used to say that the Bandit was more suited for baseliners and the Warrior for net players. However, as a baseliner myself, the Warrior has been great, and it has much better feel on everything. Then again, this is a subjective statement and it is probably best if you can actually demo both frames before purchasing.