Hi Dave
I used to own a cotic soul and was very pleased with it's performance 🙂 the back end really does have a spring in it and I found it comfy when I went to north wales . My build had a set of 140mm bolt thr forks and although this was good for downhills it did wonder slightly up hill ( not much ) so with 120mm forks this would be perfect 🙂 I'm 5ft 10 and the medium was fine for me but bare in mind these frames are ment to be compact and chuckable which is exactly what they are like trust me , if you have any doubts phone cy at cotic he is very pleased to help , hope this helps
Richie