dw:
According to their adverts in FLYER. over the past few months, they are 'fully JAA approved'
(Sorry, my crystal ball was radiatingly fogged!

)
The advert I saw today for a Czech school didn't say 'fully JAA approved' .. not got it to hand and can't find it in 2 previous mags but the advert I saw had some strange phrase - was it "JAR qualified"? Anyway whatever it was, and whatever advert you are looking at, if you are interested, you NEED to ask and know the answer to what sort of licence or ratings you will end up with.
It's certainly not clear to me from the advert I read that you will get JAA qualifications without doing a foreign-ICAO conversion elsewhere afterwards. (This doesn't mean the place in the advert I saw doesn't get you a JAA licence, I'm just saying if it is for JAA qualifications, it needs some help with its advert!). I personally would at first assume from the wording I saw that it would be a Czech licence.
In one sense it doesn't matter whether it is a JAA or Czech licence / rating providing you KNOW in advance what you are going for and understand what to do about it should it be the Czech version, and then compare "apples to apples" - it's your choice where you learn. I meet SA PPLs in the UK who chose to do what they did, but knowing in advance exactly what they were going for (an SA PPL as a step towards a JAA CPL) and what it meant.