Reading comments and advice here on short throw projectors.

Looking at "projectorpoint uk" I came accross the NEC WT610 and WT615 Short throw projectors, (6ft image from less than 2ft ) very high spec !
Yes they are quite pricey. however they seem to have dropped in price from 4000:00 to just over 1400:00 .

So, anyone using one of these ?
Are they any good for flightsim ?
and why the big drop in price ?

Would like to know what you think