I've had only 3 OEM chains in 100,000 miles. I use a Scottoiler, but 35k per chain is pretty good. I reckon the Fazer OEM chains are well worth it. And pulling the swingarm out to put one on only takes an hour. Very easy job.
Scottoilers can be messy, but you never get a tight spot with one and with the touring reservoir, you just never have to think about chains. My current chain's done well over 30k and it's fine.