I regularly use feelunique as I find they have some amazing deals and I am a huge buyer of all things cosmetics!
My favourite part of feelunique is if you join their "VIP Rewards" , you get to choose one brand (you can change your 'brand for life's everything 6months) and you get 10% off their products everytime you order, also every £75 you spend with them you get £5 voucher back, and every friend you refer gets 20% off as do you on your next order!
Everything over £20 is free tracked delivery which always comes securely and on time, I have personally never had to return anything I've brought, but it does come with a free returns label so you can pop to the post office and send anything back without any trouble.
They regularly put deals on including free samples or free products when you buy certain things, and you'll find it has an amazing range of average to luxury products.
The only downside for me is I dont like design of the website, it has a few flaws and isn't always the easiest to navigate if your just browsing, rather than using the search bar. However this wouldn't stop me from using it at any point.
I would highly recommend this retailer. 10/10 from me!