I've owned six LionSteel titanium framelocks -- two SR-1s, HEST folder 1.0 and 2.0, and now my pair of LionSpys that arrived yesterday -- and IMHO they know how to make an excellent titanium framelock.
I completely agree that the HEST 1.0 was a mess -- mine had the same poor lockup/lock slippage issues that a lot of other people's did. However, that seems to have been due to dumb design choices/changes rather than any fundamental issue with the manufacturing competence, tolerances, etc. of LionSteel. In particular, the stop pin of the HEST 1.0 was resized on the fly after users who got the early limited edition HEST folders noticed the blade tip protruding slightly above the handle when closed. DPx and LionSteel decided to make the stop pin smaller so that the blade wouldn't sit as high when closed, but in the process they threw off the lockup when it was in the open position.
Were those boneheaded oversights that someone at DPx and/or LionSteel should have thought of or noticed well before the HEST folders started hitting the streets? Absolutely. Do they make LionSteel forever suspect as a manufacturer? I'd argue 'no': with the exception of the HEST 1.0, the lockups on all of my LionSteel titanium framelocks have been superb. That includes knives made before the HEST 1.0 mess (my two SR-1s) and after it (my HEST 2.0 and two LionSpys), suggesting it's not just a recent development (i.e., post-HEST 1.0).