In the hifipig.com write-up, they mention streaming at CD quality and storing locally offline.
The storing offline is not mentioned direct from Tidal/Wimp.
If this were the case, this would defiantly be an interesting alternative to buying CDs and ripping.
Reading some other links there is also talk within 12-24 months (closer to 12) that there would also be HiRes content streaming... see what unfolds.
At the moment I'm enjoying the Napster interface into Sooloos and let's me try music I wouldn't have otherwise listened to and then decide what CD to buy next, to keep a high quality content... or look on one of the HiRes download sites.
If I could listen to a service like Napster and have the same interface into Sooloos but at CD or HiRes quality and then later download what I want to keep, then �19.99/month is a good deal.

otherwise I think it's a little overpriced.
Without the download option, I think I'd rather stick to purchasing physical discs or downloading HiRes files that I own as that equates to 2x CD's/month.
Still good to see things going in this direction though and I may give it a go for the short term... my thoughts may change due to the convenience.
Darren