I am picking one up next week for sure, the 22/45 5.5"Bull Barrel has been on my mind for awhile now, I am way overdue for one. In my opinion, it's one of the best platforms to train the basic fundamentals and plink all day with out hurting the wallet.
Based on my homework:
They are Accurate, Reliable, eats bulk Ammo for Lunch, price is right, Two magazines and a Rail? are included out the box and Mags cost 18$ Each+/- for future reference.
Only downside from what I've read: Magazine Disconnect, Magazines does not drop freely out the box, a pain to break down to clean but gets easier over time, Loaded Chamber Indicator "only MKIII series", front heavy? but I am not complaining.
Aftermarket parts can fix all those issues and are cheap/affordable, as well as a cool Project to suit your specific needs.