I've actually got a CTD 85 (identical to the CTD 80, only silver!) - got mine for £285 from a local store.
Hotpoint were hopeless in the run-up to even getting the machine (I documented my woes on my blog and have had several other customers in the same situation contact me!!!) - I paid for it in August 2004 and it didn't arrive until three weeks ago!!! (I'd actually ordered the CTD80, but when i saw that the place I'd ordered it from had the CTD85 just arriving on the shop-floor as a display model I persuaded the manager to give me that one since I'd been waiting so long!)
In answer to your questions (only some though, it hasn't gone wrong so don't know what Hotpoint's after-sales care is like but, based on their pre-sales care, I'm not expecting much!) the machine is very efficient at drying the clothes and the redesign (having the water tank in a tray at the top, just like in a washing machine) is much more convenient.
I'm a student, living with three other students, and the dryer is used at least once a day and being able to use the 'Set and Forget' programmes (whereby it senses that the clothes are dry) is good for our electricity bills! Also the delicates cycle is handy for drying non-tumble-dryable items when you can't be bothered with hanging things all over the place like a Chinese laundry! It's being put through it's paces and is sticking up well!
However, it is incredibly noisy - think Harrier Jump Jet and add a few decibels...!!!