I got an 8kg LG heat pump dryer in the November sales. Many reviews complained of clothes coming out wet after endlessly long loads and sheets tying themselves into wet balls. My experience has been great. On 'normal' dry, clothes come out initially feeling slightly damp but are genuinely dry after 30 minutes in the washing basket. On 'Extra' dry they feel completely dry immediately. Sheets can ball up a little bit but still get fully dry.
The lower energy consumption is highly noticeable. Not long after we got it I did 7 loads in 30 hours (gastro bug hit the whole family). I barely noticed an increase in power usage on that day - maybe $1.50 more than the average for the week.
