What JRH said about Timneys. IMO they are the last resort or close to it, and haven't proven very satisfactory for me in the past. OK for a hard-pull (3 lbs) hunting rifle but not suitable for really precise lighter-pull shooting. AAMOF the cheap-looking Dayton-Traister triggers have given me more reliable, less variable and thus safer service than many of the Timneys. I'm not recommending the D-Ts especially, just saying that I like them OK in comparison to the Timneys except for their looks.
IMO only a foolish or ignorant person trusts his adjustable trigger implicitly. A wise and prudent person will check his rig often for potential slamfires, by energetically slamming the bolt closed on an empty chamber and/or dropping the cocked-but-empty rig onto its butt.
If your particular rifle or gun can't stand being dropped on its butt onto a very thin leather pad on the floor then perhaps it wasn't constructed or adjusted properly in the first place. IMO it's the same with dry-firing, if my rig can't stand it then I correct the problem or change to a different rifle or gun. IMO it's more than a little ridiculous to pay thousands for a product that will fail under normal usage, I don't care HOW prestigious the brand name or maker!
Sorry, end of rant, regards, Joe