The venue is perfectly good but if you're after something very chichi you'll probably want to look elsewhere. In terms of what's important though it was excellent, the manicure was executed with great speed and precision and the staff were very friendly.
I was really disappointed by OMG nails. Firstly, my nails were prepped horribly - my natural nails were left jagged, and cuticle prep was non-existent. The therapist actually used her fingernails to push down my cuticle. The acrylics I had put on ended up looking ok, but on closer inspection were uneven and not properly shaped. I was also charged an additional £15 for chrome, meaning the service totaled £48 for plain acrylics with chrome - I could've had a luxurious experience for this price.