Yeh last weekend, got 10 tanks through it, its got some pep! It was a bit of a bitch to get started the first time to break it in, but once I got the initial break in out of the way and finished with the rest of the fun the engine runs fine. My old STS/HPI .12XS was a bit easier to break in, but the OS is a bit more stable it seems.
I also bought a STS D3R 3 port modified motor to use in some series races I am going to try and run (3 port only rules for the series)