I have a condenser one and it just means that instead of having the pipe, it has a container to catch the water which you empty periodically. I find it very good, doesn't use a lot of electricty and for example will dry a whole machine load of towels in 50 minutes.
I think I paid about £129 for it about 6 months or so ago.
It's probably because condenser dryers used to be very expensive but they've come down massively in price and they are much more convenient that evacuation ones in that you can put them anywhere - they just need a plug to work.
we have one at our nursery and it is rubbish, we do alot of washing and it takes several hours for ours to dry even the smallest of loads we often resort to putting clothes sheets e.t.c out on fences to dry, thank god the weather is half decent.
I can let u know the make on monday so u can avoid that brand if you want?
I've got a condenser dryer and love it- a container underneath collects all the water and a light flashes when it's time to empty it. If you have a gap to stick the vent through there's probably no difference, although my condenser does seem bigger than most normal ones I've seen (it takes 6kg, no idea how that compares!)
I have bosch washing machines - would not use anything else as they are so reliable.
Condenser machines are only useful really if you need to put them somewhere where you can't run a pipe to the outside. If you already have a space with a hole for the pipe I would just get a normal tumble drier, tbh.
I had a condenser a couple of years ago, it was great as it lived in an outhouse without a window. You do have to remember to empty the water container though, many a time I was tumble drying something urgently, had forgotten to empty the container, and the clothes were just being tumbled around in a cold machine. Perhaps that was just my crappy model though. In any case that has put me off getting another condenser. It seemed to take longer to dry things than a normal one as well.