With this shoe, you can (and should) modify your foot technique to a more "pulling" style. Gripping a grip with your foot is fantastic, edging power is very good, smearing on flat surfaces less. For a high level shoe like this, fitting is surprisingly good, does not hurt to much. Top quality. Good tool for the advanced user and definitely not for every route! The sole is curved, not flat. That gives you a completely different feeling. The vibram rubber may be a little bit harder than 5.10 stealth, but depending on your weight and the temparatures, that can be either an advance or an minus. In cold temperatures, 5.10 rubber is a little bit more sticky. In hot conditions or on rock in the sun, I feel the 5.10 rubber to be a little bit glitchy under heavy pressure.
Size it SMALL! If not, you'll encounter some torque because the toe box well be/become too roomy then.
One point to take care for: A stitch in the toe box can - depending of your anatomy - sit directly on the knuckles of your big toe. If so, you should look for another model. Otherwise it will make your toe bleeding after awhile.

Excellent shoe overall, but very specific. Actually it is a pretty soft shoe with a very down-pointed camber, this means that it's amazing if you have a "use feet like hands" technique (e.g. you like to "grab" high footholds and "pull" them instead of just edging onto). This climbing fashion is pretty obvious on overhangs and this is why the testarossa is considered an overhang shoe, but some climbers (me, but I know others too) might find its "pulling" power very useful on vertical terrain and even on moderate slabs. On the other hand it doesn't edge like crazy if you don't have a strong foot : you can use very small footholds, but you can't put your whole weight onto them without a big effort from your toes. definitely NOT for old-school frontal-style "short steps and three points of contact with the wall" technique, even if you can climb 5.13 in that style...And I don't think this shoe would perform like crazy in crack climbing...
The second big thing about this shoe is the "feeling" : not only it is very sensitive, it's also very comfortable! The inside of the shoe is very soft and feels "velvet-like", this means you can fit them waaaay tight without pain (i mean this is for people used to super-tight shoes...)...The lacing system is very good and the shoe stretches a lot except for the toe box, which is lined with a sort of anti-stretch "velvet" you find in the heel too...fit tight : tightest you can fit or 1/2 size more for performance , maybe 1 full size for (hard) multi-pitches.

I have climbed in these shoes for only two weeks now and I absolutely love them. I expected to have a painful fit because of the downturned toe but to my surprize they are extremely cumfortable! Their edging power is insane, you can literally stand on the edge of a dime! I climb in the Miura and Cliff as well, neiter even come close to matching the performance of the testarossa! They are completely worth the 130.00!

This is the best shoe I have ever used! I've been using the Miura for years, but wanted to try something new and haven't looked back since I got my hands on a pair of Testarossas. They fit my feet incredibly well and they are so precise. They are worth every penny!

coming to this as my sixth pair of shoes, last pair were anasazi southwests. am very happy. paid 130 retail.

performance: fantastic edging and frontpointing, gave me confidence on little worthless footscums; inside and outside edge alike. heel hooking worked fine, smearing was acceptable. but this shoe was designed for front toe-box power, and that's what you get. the rubber isnt quite as sticky as mad rock or five ten, but still performs great.

fit: shoes fit me like a sock. it's downright amazing how comfortable they are, despite the camber and the toe-power, which i normally associate with a lot of pain. unbelivable, this shoe was a hands down winner for fit. i'd suggest trying them on before buying online or whatever.

sizing: i went one size down from street (in us sizing). they run a little larger than anasazis and mad rocks.

would i buy them again? absolutely, even if it means eating half cooked ramen out of a used can for a year. they cost mucho dinero, but you'll be glad you got them.