I don't run them anymore but had good luck with them when I did, I got more life out of them than the Hoosiers, or MT of the same size. I swithed to MT for one reason, I needed a size they have 31-10.5 W, I used to run the Phoenix 29.5- 11.5 W's but can't run those in some of my races, so I just decided swaping tires wasn't worth it and stick with the 10-5 MT now. Guess a lot depends on what you are running, car, weight, how fast, size ect, but I really like the Phoenix slicks, ran them pretty much for 7 or 8 years. My car runs low 10's, weighs 3700 with me, 60's were consistent 1.41 oe so, depending on which track at density altitude. EDIT BELOW

Didn't notice until after I posted that you asked about Phoenix 10.5, thought it was Phoenix in general, my info may not help you, but the 31-10.5 MT's have been better for me than the Hoosiers.