My wife and I flew ORD
on N215UA (777-222) in October, 2004 in First - 2H and 2J
. I'm a big dude - 6' 2", 250 lbs, and I have to say it was worth it for me to upgrade. Also, getting to take my wife on a vacation in "first class" still has some prestige value. The mai tais are pretty good, too! Plus, on the way back on N212UA in 4H and 4J, the first seats are decent sleepers. No, they're not the fold-down kind that transform into a bed, but they're big enough that you can get somewhat comfy. Ambien helps, too!
If you get a bulkhead or exit row seat in UA
's Economy Plus section, that might be just as good for you, but I was happy with the decision to upgrade and I'd do it again. Hope that helps!
To fly is to live.