I purchased these at the same time as a Thomann 22 double bass. I decided to leave the strings that came with the bass on it for a week or so to see how I got on with them, and if I would notice the difference between them and the no-name pre-loaded jobbies. To say the difference is dramatic, is putting it mildly! ...
The first thing I noticed while stringing up is the Evahs were silkier under the finger, and once I had them tensioned, and mid-change between the two sets of strings, I noticed a very definite difference between the finish of the strings. The Evah is a much brighter metal, whereas the stock strings were that bit duller.
As an aside - here's a tip, if you are buying strings, don't forget (if you haven't got one already), to buy a specialised double-bass string winder! ... there is a very good one here on Thomann that's only a few quid but your wrists will very much thank you for the purchase!
So - once I had them all strung up and roughly in tune, I started some basic playing to stretch as I brought them into tune. The next thing that struck me was the far lower tension compared to the stock strings ... far far easier to play. And finally, once everything was in tune and I started some pizz and then arco, boy, was I blown away ... these strings gave a deep, full, rich sound that have made a huge difference to my bass ... I am extremely happy I coughed up the few extra quid (they are costly) ... these strings and I are going to have a long relationship. I am superbly pleased with my purchase, highly recommended!