They sound great, feel great, I love 'em, but the low-B was the wrong scale length, so the set was not usable as sold. I have e-mailed Thomann, so I await to see whether their customer service will rescue the situation.
UPDATE: Thomann customer service was great. I messaged late at night and got a response first thing next day. Replacement set shipped the day after. Took about a week to get here, but most of that was spent at UK customs.
Second set has correct length B-string, but the end result is perhaps even more disappointing. The quality is awful. They come coiled in the packet like all strings, but I could hear it sort of crackle as I straightened it, the outer winding is not tight enough and you can feel it moving on the core. Unsurprisingly the string sounds pretty dead. After I wrote the first review I read some of the others and it seems this is not an isolated case (maybe I should have read them first!)
I don't have a 5-string, I bought these to try BEAD tuning on a 4-string. I used the good four strings from the first set in standard EADG and it sounded great, but the B just spoils the whole thing. If you have a 5-string or want to play BEAD the other strings are no good without a B. If you want to play standard 4-string though the 4-string set gets my recommendation!
I have never played a low B before, so I cannot compare it to other strings. I expect a bit less response at that low frequency, but I believe that other strings must be much better than this or 5-strings wouldn't exist.