I just finished putting together a CO G17. I was really thinking about buying a Trubor, but ended up going the CO route. I have about $750 in the pistol, and another $200 in a holster and mags. With the money I had, I also bought an Arredondo speed loader bracket and tubes for my shotgun, and had $$ to spare.
I haven’t used either in a match yet, but I think I’ll like CO.
BTW, magazines were a big factor in my decision. I bought 3 140mm ETS mags, a 170mm ETS mag, and a 140mm magpul, all for the same money as one 140mm MBX 2011 mag.