I bought the 520's about 3 weeks ago and I'm still breaking them in. I'm wearing them to work everyday which isn't real tough on them, but enough to start to get some flex in the leather.
When I get home each night, I'm packing some weight up and down a large ridge behind my place with the Asolo's on..they are finally starting to conform to my feet nicely, but the first week or so they were uncomfortable, simply because the leather was so stiff. I'm also putting Obenauf's Heavy Duty Leather conditioner / preservative on them each day before I wear them. A heavy coat near any flex points is aiding a little in the break in, and I notice everyday that they are more comfortable going up and down the ridge.
The support they have is unreal, and once fully broken in I'm guessing these boots will be a favorite of mine for years to come. I would have liked to have purchased them earlier this year to break them in, but I've been going through boots and hiking boots like crazy trying to find a good fit with stability. My first big test for them is going to be an elk hunt in New Mexico (leaving Sep 10th), so I'm putting as much time into these boots as I can before we leave.
I have tried Danner Pronghorns, a pair of uninsulated Columbia's, and some Lowa hiking boots. All of them felt worse after wearing over a period of time and the stability wasn't there so they all went back. The Asolo's seem to be getting better each day, and from what I can tell so far, seem to be the best constructed out of all of the boots I have tried. I used to love me some Danner's, until all of the tags started reading...made in China. If they don't up their quality a little, I doubt I will ever buy another pair of Danner's.
Anyway, give them a shot and break them in hard, use some conditioner, and I think you'll get them fitting nicely. With that said, if you think it's a severe pinch though, I would just exchange them for the identical model and try them so you don't waste time breaking in a pair that has an issue. Either way, I read a lot of the reviews from REI and many said no break in needed, but I've personally found that these boots are built tough, but need some serious break in time to conform to your foot and become comfortable. These are made to both hike, and carry a load, so they aren't going to be nearly as comfortable out of the box as say a pair of Merril's or something. Hopefully I'll have a good experience with them out in the mountains of New Mexico, especially while I'm drawing down on a 350" screaming bull!!! :darkbeer:
Good luck