Gave them a try recently on BTS-EDI route as all other options, including from VIE are via somewhere and make it a very long trip, and it was a very short weekend. The trip was OK but to be honest way below the standard of many other lo-co's that I have tried. Cattle class truly would be an apt description.
Had to smile at the small print in the ticket which would test a well qualified corporate lawyer. Particularly the "extra-bag" fee which incidentally doesn't come with any extra luggage weight, i.e just gives you the original 15kg divided by 1/2 or 3 bags at 10/20 or 40 Euro, strikes me as being deliberately misleading with intent to catch out unwary travellers to be billed excess baggage allowance at fees which are often higher per kilogram than the the fare per person per seat. It comes very close, but not close enough to "theft by deception". I did ask a Ryan air staff member if they got many takers willing to spend the equivalent of a full seat fare to divide 15kg in to three very small bags, she assured me that this happened quite often (which I doubt).
In any case, come Easter, when I need to take the kids and all their gear for Easter to EDI, I shall be paying a bit more and travelling longer in order to have a reasonable level of convenience.
And for the poster that said he/she has seen lots of Europe for a pittance thanks to Ryanair, you must either be one of the ones whose contirbution to the local economy on arrival is lamentable or one of the ones I see being regularly dragged off by the local constabulary for p1ssing in the fountain in the main square.