I can't comment on the trousers but I have the jacket, which I bought for £140ish, and it is a good job. The colours work well on the hill and it is relatively light weight which makes it ideal for September stalking. You can always add a fleece etc. in winter or I use my heavier Musto Highlands for hind stalking. Everyone who has seen mine has loved it and hinted that at £140 they will be having one.
On the down side it doesn't have as many pockets as the Highlands, it isn't as long as the Highlands and I don't think it is as robust either. I can't comment on long term robustness but don't think it would sustain a lot of hard use. Also be careful of the sizing as it is a little different from the other Mustos and you probably need a size bigger than normal.
It is slightly noisey, though not too bad, but not enough to be a problem for hill stalking and I've used it in forest situations as well with no concerns. The other thing is that the fabric does go a bit "shiny" when wet if that makes sense so if you are after the ultimate in camo then it isn't for you.
All told I think the coat is excellent for moderate use in moderate weather especially on the hill.