I never had a prob with Charlie going into his grobag, think he's been in one since about 6months when he started to roll all over the cot. I started as it stopped him getting his legs caught in the bars & would then sleep longer naps etc...now I love not having to even have any blankets in the bed. Just into pj's, grobag & into the cot. I really don't think they feel restricted, that's prob just a Mum worrying. The arems are not covered & there is plenty of leg room. Charlie is always sitting up in the morn when I get him out, finds no probs moving about & he sleeps on his tummy & I've even seen him crawl a little in it.
I got mine from Bambini Pronto too, they do often have specials on, just a matter of if you like that particular design (I'm a bit fussy).
I needed more than one incase of accident during the night, so opted for cheaper version & the material is no way near a soft or nice & doesn't have the bit over the zip that stops it rubbing. So I prefer to spend a bit extra.