I always liked them much better than Heli-coils. The only thing that makes heli-coils easier is , they can be trimed for a specific hole depth. Timesert's can only be used in a through hole or one of correct depth due to the self locking cold rolled bottoms. From the site-
"What are the specific advantages of TIME-SERT over Helicoil? The TIME-SERT® inserts have a flange, which will give them a positive placement on installation for “accurate specific depths”. This ensures that the insert does not wind down into the threaded hole. TIME-SERTs are solid bushing and self locking. TIME-SERT being a solid bushing insert gives it added strength. TIME-SERTs have no messy prongs to break off down in the hole which can be a problem in deep holes. TIME-SERTs are self-locking having an actual locking feature which will prevent them coming out when a bolt is removed, again adding to the advantages over coil types. TIME-SERTs are timed internal to external, which give them a thin wall for tight applications but added strength over the coil styles.
Thin wall, Solid bushing, Positive placement, Self locking, Steel bushing.
Customers have asked if they may also use Loctite® adhesives for additional strength. Yes you may due to the solid wall design, there is no danger of loctite passing thru the threads of the insert and locking up the bolt as in coil types.