I enjoy premium, made tons of NP off the SSW. Don't have to press refresh 50000 times to see if anyone has a PDE in their shop for cheap trying to snipe it on another account, or just selling it off someones hacked account or whatever the case may be. Plus by the time you would have found it on the regular shop wizard it is already gone.
The boards are nice as well, much quieter and tight nit. Plus as others have said TNT responds to Premium accounts much faster and such. Overall it is nice and quite cheap. You also support the site, so all-in-all it's a win win.