Anyone try these for a Glock?

I have not.  I went with a 9mm conversion for my .40's for the cheaper ammo.  However, the general consensus on Glocktalk is that the Advantage Arms conversion is much better.  It has GLOCK sights, so the sight pictue is the same, and you can replace them with any sights that you can put on a GLOCK, so you can have the same sight picture when you practice.  Ceiner doesn't.  AA's slide locks back after the last round, has some other features Ceiner doesn't.  Costs $50 more, but mags are cheaper.  go to www.glocktalk.com and do a search, lots of threads, lots of first hands with both.  

Thanks

I bought one for my Glock 19 through Dillon Precision when they first came out in their catalog.
The conversion unit is very well made in my opinion.
Shooting the conversion unit is a lot of fun.
Only problem I have seen is it is extremely tough removing the conversion unit from the frame at times. Its also ammo sensitive at times, but a whole lot of fun.