I've been climbing in the Speedster for a year and a half. i wear a 10.5 street shoe, a 42 in the LS Solution and a 42.5 in the Speedster.
If your looking for one shoe to fulfill all your climbing needs this is probably not the shoe for you. It is highly specialized and requires good foot strength and precision to take full advantage of it's features.
I use this shoe for 90% of my sport climbing and about 20% of my bouldering. The shoe works great for indoor climbing, but at $130 I find it a bit expensive to wear out on plastic.
The sensitivity is amazing making subtle irregularities and smears feel secure. The Speedster excels on steeper terrain, but I find it difficult to use the inner edge on small edges and the heel can slip when engaged in heel hooking.
Overall, when used for the intended purpose the Speedster is in a class by itself.