I had no intentions of buying it either, but I downloaded the trial (like I always do on wednesdays) and actually really liked it. Bought it the same day - something I rarely do with a 1200MSP game!
It's great, but the later levels can be frustrating to the point of having to punch yourself/the sofa etc!
Also, I don't know if all regions get this, but in the UK, if you buy all 5 Summer Of Arcade Titles before the end of August, you get 800MSP credited onto your account. So you spend 3200MSP, and get 800MSP back. That's not a bad deal if you were planning on buying the games anyway.
The games you need to buy for this are:
Splosion Man (800MSP)
Marvel Vs Capcom (1200MSP)
Turtles in Time (800MSP)
Trials HD (1200MSP)
Shadow Complex (presumably 1200MSP)
I'm waiting on Shadow Complex to make my decision, as I already have Trials and Turtles, and was debating Splosion Man. If Shadow Complex is a buy, I might as well pick up MVsC for what is essentially 400MSP!
