I love my Manduka mat and I think it was the Eko one I ended up with, but mine's a 4mm. I think it would depend on whether you're planning to use it on hard floors or carpeted area? Standard length one has been fine for me so far - not had any problems yet
I'm 5'4" so about average height I think? I use mine on carpet, but not a terribly brilliant carpet. I think I did a package where I got a yoga towel, carry straps and the mat which was handy. I think Adriene recommends using a rolled up towel or doubling up the mat to give more cushioning for knees (and that's certainly what I did while in a hotel with no yoga mat!)
Ok, thanks! I measured my cheap one and it's only 150cm, no wonder I thought it was short!! I suppose I can always use that under the new one if I need extra padding.
I meant to ask this before - when you unroll the mat, does it lie flat or start to curl up? My cheap one curls up, so I roll it inside out half the time. I hope that is just because it's weird plastic??