I'm 5' 6" and went for a 17" as it was recommended on the site that 17" was ideal for 5' 4" to 5' 8". I do find it a tiny tad too big and had to swap the spacers so they are above the stem to make it a bit lower. I also have to fiddle with seat post height depending on terrain but apart from that I absolutely love it and find that it loves eating the varied terrain of the NYM as much as the trails at Dalby. I also love having 5.5 inches of travel up front. My only quibble is a lack of lockout on the Vanillas which gets very annoying on tough climbs. I think the price jump is a bit unfair on the 2009/10 models though considering the downgrade in spec – i got mine for a grand with full XT groupset and now it's 1.5K with SLX and an XT Shadow rear mech. I don't think I'll ever need to buy another bike though – it does everything I want, feels great and looks lovely.