Child Sleep Issues: Halo

Halo Sleep Sack Vs. Blanket for 1 Year Old

My son who just turned a year has been sleeping in his 'Halo' Sleepsack and I'm wondering if he's old enough to go to sleep with a blanket instead. Does anyone have any experiences with this? I don't know if a blanket would be too distracting anyway and he has no issues with sleeping in his sleepsack, but I was just curious as to how any other experienced moms deal with this. I'd appreciate any comments or advice on this :)