I agree, it is pricey, but for street riding, by the time you figure the price for a good jacket and pants, plus the hassle of getting the right fit, it can be almost the same price. Not dealing with leather is a plus, too.
The Aerostich suit can be custom tailored for you if you find one off the rack doesn't fit you right. Their customer service and work quality is top notch... I guess you pay for that upfront. That is a well designed, well thought out MC specific piece of gear was my main attraction to it and it delivers.
For dedicated track work, I completely agree... stick with a leather suit. The AS suit can be used at some events, but not all.