You don't buy a Nicolai because you want a light bike, you buy it for top quality German engineering, durability and a superb ride.
I have a Nicolai Helius AC 2013 26" which isn't a 27.5" but many would argue the only difference is the number after the name.
Anyway, it's a superb bike in every way and climbs like a demon. It is size large, has 160mm Pikes front and has been built up fit for purpose for where I mainly ride which is the mountains of Scotland and the Lakes. It weighs in at just over 31lbs and I could spend £100's making it a bit lighter but I am a big lad and most of the descents round here are like full on DH courses so it needs to stay in one piece. I am amazed (and a bit skeptical) at how light some people claim their Nicolai's are but I would say the key thing would be wheel and tyre choice to get the weight down.
I got mine in raw as it was one of the free options and I assumed it would wear much harder than paint. If I had the money I would have opted for anodized but nothing to do with weight and everything to do with how durable that would be.
I think the main thing with Nicolai's is they ride miles lighter than they weigh and really are superbly well made. I am planning another 2 Nicolai's over the next 2 years but will gladly pay the 26" premium to future proof myself against the next industry lead MTB marketing con job which will be re-inventing 26" wheels within 3 years!!!
+1 for Gravity Sports, top bloke and great service (and best price for Nicolai's in the UK!)