Do a search on them. Seems quite a few unhappy punters with lots of delays in getting through the training which has the usual knock on to costs. Print out all the threads on them and put the questions to them at the show and see what they have to say in response.
Also make sure that what it says on the tin in terms of licences etc is what you will get.ie: UK CAA or Greek.
If you end up going with them then don't pay up front either. That way if it all turns to custard you can cut your losses and they won't have anything over you. Goes for any school.