Excellent strings. I recently switched to Blues after a long search for the perfectly versatile string. And though they aren't perfect they seem to do everything well. I am very satisfied with these strings.
Pizzicato on Blues is responsive, warm and full with big resonance, yet clear and punchy too. Imagine that. I play pizz mostly though I can also say that arco on Blues is quick and reasonably responsive. The Blues are not as smooth sounding to me as Dominants or Pirazzis under the bow, and not as quick, accurate, and responsive as Corelli strings, but they do pretty well. You can even slap the Blues with reasonably good sound results; not gutlike, but not so metallic either.
I'm using the Blues on a fully carved Chinese bass that has been well voiced, a responsive instrument. I've used gut strings on this bass, as well as Corelli 370F, Dominants, Pirazzi, Helicore, and a combination of Innovation and Dominant, as well as several other sets and combinations I can't remember. On this bass the Blues are the best. Corelli 370s are my second favorite.
The tension of Blues is relatively soft and even across the strings, 55lbs. This is more tension than standard gut strings, and a few lbs less then Corelli 370F. So this means they are also lower tension then Spirocore Weich, Helicore Lights. The Blues are easy to play, with just enough tension that you don't have to overplay them, as I find necessary with gut strings to quicken the response. You don't have to work so hard with Blues. The Velvet people understand string tension and response very well. Good for them. And good for me for buying a set!
I have only one complaint, the A string has ridges that hang up my fingers a little. But I've adjusted, and playing the string a lot has worn some of the grabbiness out of it. And I should also say in ending that I haven't had the Blues long enough to know their durability. I play them every day, and perform often, so I'll soon know about that.
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Updated, Oct 13.
After playing these strings for a month and a half, including regular performances, my opinion remains essentially the same. Except I do have one additional critical observation. The copper windings tarnish quickly, and the strings become grabby as a result. It's not just the A string that is a problem, due to the ridges, they all tarnish and become grabby. Regular wiping with a cloth helps, though the tarnish returns quickly. I can feel it, though not really see it on the strings. I wipe them often during gigs, and still the problem persists. Such is the nature of copper, so quick tarnishing is intrinsic to these strings. I'm sensitive to it, others might not be.
The strings sound so good, especially when playing pizzicato, that I will manage the tarnish problem. And if Velvet can improve the string design to overcome this, perhaps by using a copper alloy or other metal that resists quick tarnishing, yet still retains the sound and tension of the Blues, that would be a great set of strings.
Seriously, I'd advise you to just stick with the Garbos if you like them. But if you must... 
