I bought this gun over a year ago at a decent price (sub $400 including tax) and it has been a great shooter. Over time I've spent way too much money and have accrued enough spare parts to build another one. Seeing as how we're on an AR15 forum, I'm sure some of you can understand the need to tinker and the plethora of spare parts that comes after.
Parts that I've swapped onto the Girsan:
M9A3 barrel & locking block
#13 hammer spring (just switched to a #12 hammer spring)
Wilson Combat thin grips (required about 15 seconds with a file to fit)
Beretta oversized mag release
Beretta Elite II hammer
Langdon Tactical NP3 trigger bar (required about 15 seconds of filing the over-travel stop)
Beretta slide stop (Girsan slide stop will only lock back on an empty MecGar mag, not on other brands)
And of course, the LTT RDO slide. I wasn't sure if the slide was going to fit (I've read conflicting reports online) so I borrowed my friend's 92FS. The Beretta slide fits on the Girsan frame (initially feels very tight), but the Girsan slide doesn't fit on the Beretta frame (gets caught up near the end, didn't inspect it but I'm sure it could be modified to work). When I received the LTT slide it was very tight and hard to pull back. After racking the slide a few dozen times it was silky smooth. Just put 50 rounds through it to sight the 507C in and it was flawless.
Overall I've been very satisfied with the Girsan. I know you'll say I should have just bought a LTT from the get-go (and I agree lol). I do plan on buying a Centurion whenever they open orders back up. As for the RDO, this is my first time owning a handgun with an optics cut and I think I've been converted.