RE: Chosing a New Engine OS, Magnum, Thunder Tiger
Of the ones you list, the new OS engines are much better than the FX series.
Ihave never seen a used FX that wasnt peeled but I have heard no trouble from the ABL engines.
I have a Thunder Tiger 46Pro that is awesome and have never seen a TT liner peel.
I am not a Magnum fan but I think the new XLS46 is an improvement on the XL46A, my XLS15 was much better than my XL15A.
If you can afford the OS go for it, if you want to save a few bucks get the TT46Pro, if you want a Magnum buy it new with a warranty so you can send it back if it isnt right.