I have used Secret Sales in the past and haven't been disappointed as I only purchased from known brands. However I spotted a lovely coat today from a brand named EMASS (never heard of before?!). It was at £115 which isn't unreasonable for a fashionable coat but the original price was down at £350 which is quite a lot! I decided to google EMASS coats and a Ukrainian website popped up - long story short - they sell it for 2500 rph which is £70!
I can't say anything bad about buying known brands from them - but would never ever buy from them unless the brand is really well known!
Always do your research!