Re: X65vn - $$$
It will always be a good light , just mass gives it an advantage of using high outputs for long durations. A lot depends on use, if a couple of minutes of WOW is needed then most will do the job. If you needed say 10 or 20m of WOW, maybe looking for winners cat, or a S&R mission....or just a longer WOW moment, mass is needed. Plus I think huge lights are cool, the heft,size for that feeling of security/reliability/quality .
The tn40vn will still be the class leader for its size in spec 4.