Sorry I haven't followed up, my aircraft has gone U/S so I haven't been able to do a side by side flight test.
The pics don't tell you much, 1997 is the nflight, 1999 Bose a20, 1995 both sets, 2002 nflight, 2003 Bose.
The nflight kit was very complete & well packaged, not a backyard job. The nflight is less bulky, but not a lot in it. I leave my headsets hanging in the aircraft, so bulk is not an issue. The nflight when attached to the headphones is a tight fit in the bag, rather fiddly.
It looks like a few months before I'm flying again, so you'll have to rely on comments by others. For me, I rarely have a passenger, a new Bose A20 is nearly $1800, this nflight setup, complete, including local bought headphone freight etc was under $800.
Sorry about the crappy pics, my iphone lens must have had a fingerprint on it. Let me know how you go...Peter