Depends how cold you sleep and where you're gonna use it. I quite like my half bag + jacket setup for racing but it was too cold for me in Scotland in October (~0degC) so I bought myself a new full size bag for that kind of thing (shouldn't have sold my PHD bag but I didn't know I'd start using sleeping bags again).
Ah, you actually pay attention to those ratings. I'm cold in anything with a positive number on them so I find them basically pointless. I think my gloopy blood just refuses to circulate once I stop moving so I get cold pretty quick even though I have plenty of built in 'insulation'.
Depends how cold you sleep and where you're gonna use it. I quite like my half bag + jacket setup for racing but it was too cold for me in Scotland in October (~0degC) so I bought myself a new full size bag for that kind of thing (shouldn't have sold my PHD bag but I didn't know I'd start using sleeping bags again).