Dungeness
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Well as far as I know, only TD-1 was referred as 'Technology Demonstrator and rest are referred as 'Prototypes' but still their marking is same as TD-2,3 etc. TD-4 will be last one and then it will enter into production. Anyway from TD-1 to TD-3, There have been lots and lots of improvements and TD-4 is expected to be more lighter which will go to production.
And yes many trials have been successfully completed as so far there have been no issues in any one of them.
India's light combat helicopter completes crucial trials | Business Standard Mobile Website
User trail means "test drive" for the end users, so the manufacturer can collect feedback. Not sure how is done in India. Chinese weapons would be in PLA for "USER TRAIL" for quite some time, before the manufacturer frozen the final design.