Having bough an underbust corset from corsets-uk.com, I must say I have been pleased with it. Certainly it does not have the craftmanship of my venerable Axfords one, but I'd say it's good value for money, especially as I bought it from their sales page - less than £40 as I remember. The material is of a decent thickness with a modesty panel at the back, and of a pretty enough design to be worn as outer wear when appropriate. It seems to be standing up to tight-lacing pretty well. Yes, it was a bit 'straight up and down' when new, a little uncomfortable initially because of that, but with some wear it's starting to take up a more curved form and thus fitting better too. I possibly should mention it is quite a short design though and stops quite high in the hips, so I cannot comment on the fitting in this area for the longer styles.
Yours,
Miranda.