I flew with them AMS-PRG in 3/05 - basically just to try them out (although the price was good as well, 83EUR all-in o-w).
What I know of them is that they are a subsidiary of Travel Service (charter airline in CZE/HUN, AFAIK). They operate a small fleet of Boeing 737-500s (the smallest of "older" generation 737s).
In any case, my experience with them was good; quick check-in and on-time departure and arrival. Having said that, the seat pitch is very narrow - but they're a LCC, and you get what you pay for. For a short flight they're definitely ok.
okko
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