I own the Regal Medallion S/S Jaws and Kieron Jenkins the Regal Revolution....I've never had any problems at all with hooks pinging out, in fact if you put a size10 B175 in the jaws and pull up on the eye the hook straightened rather than pings out. The grip is amazing.....We both think they are great and the best vices for "our"needs....and yes I do like the full Rotary action of Ki's Revolution better than mine, but only just......and I can't justify the extra cost so I'm more than happy.
I also own a cheap Chinese Regal copy, have done for years......and I may get some stick but its 90% as good as a genuine Regal...good hook hold, simple to use when changing hook sizes etc....and about £30... again never had hooks ping out but the grip although good isn't a patch on the Regals
I got the Regal not because I needed it, or because it makes my tying any better......but fishing part of my life, always has been and always will be....so if I use it for the next 30 years it probably works out about £8 year or something silly - that's my justification..

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Personally I think a J-vice with Damascus steel jaws is stunning - like mind blowing, my Mrs actually said she would let me keep one in the lounge on the mantelpiece with those looks as it's a great conversation piece....but when you tie lots of different size flies it's just too fiddly, and the jaws grip can slip very occasionally....if your not in a rush to knock out lots of different sizes patterns i'd have one again.