I've always had condensor ones and have found them to be great. I have never has issues with damp, condensation or the clothes being too damp. They come with a factory preset as to the dryness level. You can adjust it if the default is not dry enough.
Our last one was a Siemens sensor condensor. It lasted 11 years. Latterly we plumbed in the condensor bypass pipe straight into the downpipe in the utility room where the washing machine drains out to so you didn't ever have to empty the water collector. You did have to clean out the condensor unit occasionally. I just hosed it through with the tap and left it to dry overnight. I think I did this once or twice a year for 11 years - no biggie. Though I have since read that you are supposed to do it monthly!
I have recently bought a new Siemens Heat Pump Condensor and also have it plumbed into the downpipe. So no emptying of water. I find Cupboard dry is not quite dry enough, but cupboard dry extra is perfect. This is on the default dyness sensor setting of 0. It can be cranked up as far as 3. I suspect people that complain that condensors dont get their clothes dry enough aren't adjusting the levels. This one has a self-cleaning condensor which never needs to be cleaned, apparently.
It was expensive - £750, but if it lasts for another 11 years I think it will pay for itself in the long run as we are a large family and it is used for 2/3 washes every other day. It is the current Which Best Buy Tumble Dryer and is A++ rated for energy consumption.
My unofficial survey of friends and family says that the more expensive condensor dryers from mid/top end manufacturers are better and more reliable than the vented ones which, imo, they are beginning to phase out because they are under pressure to make dryers more energy efficient and this is easier with condensors. But the cheaper condensors are maybe not as good as the bog standard vented ones?. Having said that, 2 people I know bought cheap and cheerful vented ones last year, with both the fan belt went within a few months.
A normal sensor, good brand condensor might be a good compromise if you don't want to pay the heat pump prices (or the Miele prices which are insane imo!)
Sorry for the essay, I have recently been researching tumble dryers :)