I think that in all walks of like there is a point where diminishing returns kicks in. There's no doubt that the BKL and Tier One will work and the former do overcome the centreing problem, if indeed it is a problem in the real world?, although the BKL look to me to be a bit of a faff.

Myself, I have had issues with Hawke and Nikko such as bad machining, offset easily stripped threads, terrible recoil pins etc, so I wont go near them now.

In all honesty, I don't think you can go far wrong with Sportsmatch. In the main they are a couple of quid more than Hawke etc, they do the job, are British made, and don't look like something you would find in a Meccano Set, utilise a recoil hole and your scope is going nowhere.