Someone asked me to do a comparison of these Yonexes so I thought I'd do it since I've played with all, and have 3, of these rackets. To me, all the rackets except the Ti80 played so well it would be a three-way tie. The Ti50 has the most power and you can hit alot of winners, and is good for flat strokes. The Ti70long is a serve and volleying machine. The RDX500mid feels great on everything, very accurate. These play so well I can't tell which I play better with, there are no limits except that of the player with these rackets. I will say the RDXmid feels the best when swinging the racket, but all three are very comfortable. The Ti80 felt a bit hollow and tinny to me although it plays well, so I rate it a step below the others.