I've got 4 or 5 customers running on either road or race attacks, with very good feedback. Grip, feedback and wear get compared to Diablo quite often. The guy next door to me is a Conti fitting centre and has fitted dozen's with no problems either.
I'm running Sport Attacks on my ST4S - replaced Diablos and apart from the profile allowing the bike to drop into corners a little easier they are no different. Excellent in the dry & wet... as for wear, not done enough miles on them yet. Apparently they were designed by the guy who designed the Diablo for Pirelli. Well worth a try
I had a set of Road Attacks on my SS and I'm now on the 3rd rear and 2nd front on the ST4s. I have never had any concerns with them and find them excellent both wet and dry. Rears are lasting me 3 1/2 to 4 thousand miles and about 6 1/2 on the front. Works out at about 3 rear tyres to 2 front ones.