I have had one installed in a Squire body-based partscaster for a couple of years and I love it. I built the partscaster using the Squire body because it's alder and super light and resonant. The Vega Trem just totally brought an already-resonant guitar to life. The harmonics just shimmer to an expanded dimension or 'prettiness' and it's a beautiful and organic sound. It can be as aggressive as it could ever need to be while eerily light to the touch. It is by far the most expressive and versatile whammy bar I've ever tried and it holds tuning better than most stock ones in my experience. If the tuning slips then usually a quick slackening then a short pull up and release will usually bring them back pretty well in tune.
The small physical mass might give people who listen with their eyes and brains doubts but whatever metallurgy they used is pure sonic alchemy to my ears. Other reviewers have commented on their guitar's tone being improved after installation. That's certainly what I experienced and the difference wasn't small.
The best analogy I can think of is if you had a Cadillac and traded it in for a Maserati. Using the Vega Trem often makes me think of driving a Maserati for some reason due to the nimble and responsive handing.
No, I don't make any money from this reply. Just a real fan! I'd be very curious to know if you try one and what you think.