I finished a 33 mile ride yesterday. Thought I would give you my final review. Unless something drastic happens, I won't post further since everythng is consistent with my previous results.
Very clear to me that these rings help with steep hill climbing. Having much experience with my bike route, I find that I am faster and less tired at the top. Some hills in less low gears. I don't seem to see much difference on the flats, but the Garmin shows my overall speed to be about 1 mph faster. Could be strictly incidental finding.
Riding with an oval ring feels absolutely no different than riding with a round ring. Nothing to get used to.
I would place using an oval chainrings the same way that I look at any other upgrade to my bike. Last year I upgraded my wheels to Mavic Kysrium Carbon with tubeless tires. Definitely an improvement over the original alloy wheels but nothing outstanding. For $90 (if you payed full list price) it is a bargain compared to a carbon wheelset. For the $35 I paid it is a no brainer.
YMMV