In reply to IRad:
I've ordered from Alpinetrek loads of times. I've never had any issues with them, including on returns. It seems that most of the complaints on Trustpilot stem from them using Hermes to ship to the UK. Luckily, the Hermes guy in my area is quite good, but your mileage may vary.
As they are a German store (Alpinetrek is just their name for the UK market - they're actually called Bergfreunde), I would suggest you check the reviews on Trustedshops too, which seems to be used more often by German companies.