I own and have used the original Colt, Ciener, Jarvis, Tactical Solutions and Marvel units.
Colt unit is a plinker with a floating chamber which requires frequent cleaning. All steel with slide locking back after firing the last round.
Ciener unit has functioned flawlessly with anything from SV Rem Traget to Rem Golden. Plinking level accuracy good for steel plate shoots. All aluminum construction, slide does not lock back after firing the last round. Plus is their 15 round magazines.
Jarvis unit is an all steel unit designed for HV ammo and slide does lock back after firing the last round. Intermediate level accuracy. No longer manufactured. Prefers Remington Golden or CCI MiniMag ammo for reliable functioning.
Tactical Solutions is an improved version of the Jarvis unit all steel superbly engineered and crafted. My unit will function (depending on frame) with SV Remington Target as well as Fed HV HP bulk pack, Rem Golden or CCI MiniMags. Intermediate level accuracy. Slide locks back after firing the last round.
Marvel, I believe I have Unit#1 which was designed for bullseye pistol shooters. Superbly accurate and totally reliable with standard velocity ammunition. Requires a heavier recoil spring to function with HV ammo. Slide is aluminum and does not lock back after firing the last round. On some 1911 frames I have been able to use it with Ciener 15 round mags.
I have not used the Advantage Arms 1911 unit but have the AA unit for a Glock 17. Aluminum slide with a steel insert screwed into one side to permit slide to stay open after firing the last round. In understand that the screws can loosen and allow the insert to fall out. Intermediate level of accuracy and only functioned reliably with Remington Golden or CCI MiniMag ammo.
In all my tests with 22 conversion units for 1911's I found that the individual unit to frame fit, weight of the hammer spring, as well as ammo choice determined reliability and could not be determined in advance of testing the particular combination. In some combo's the Remington Golden was totally reliable while in others frequent ignition or feeding failures occured. CCI MiniMag ammo was the most consistent HV performer. In my Marvel units I use Wolf MT or Aguilla SE SV ammo and have not experienced either an ignition or feeding failure in more than 5000 rounds.