Yeah, I've got something around 800+ BN-2 time across 1/2-doz different airframes, 2 of which had the Row 3 additional window mod. That certainly made a difference from a pax PoV.
I've used the BN-2 from the beaches to the mountains and everywhere in-between, in NZ. I'll always have something of a soft-spot for the (IMO maligned) Islander. I reckon they're a tremendous wee airframe. As others have mentioned already, the biggest issue with an Islander these days is corrosion and of course SB190.
I had to laugh (quietly) one day not long after arriving in the West Island... I was at a cafe in Port Hedland not completely intentionally eavesdropping the next table, where a couple of likely lads complete with uniform shirts, wings, bars & large watches were (loudly) regaling one-another with stories of their heroics in the BN-2... one mentioned to the other that he had recently "put her down and got her off again in just under 600m"!!! Sounded pretty hair-raising
I left before it was necessary to point out we regularly operated off strips sub-600m at gross weight, regularly requiring less than 1/2 the available length, without any drama... and was considered so absolutely routine to be not worthy of mention
So yeah, I reckon they're a bloody marvellous wee machine. Not many out there that'll get into tight, unlikely spots with a good load and get out with a good load too.
I too have a soft-spot for the 540's -bloody things just don't know when to quit! Damn fine mills.