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There seemed to be considerable interest in the lead up to the Lone Peak 5 release, so now that they're available to purchase I thought I'd share my thoughts now that I have my hands, er feet, on a pair.
tl;dr: The "normal" width is now noticiably more narrow than before, and the achilles heel rubbing is similar to the 4.5 model as opposed to the earlier models.
I ordered the 8.5 size from REI, who didn't offer the new "wide" size below a size 9. For comparison, I've used and loved Lone Peak 3.0s, 3.5s, and 4.0s, and hiked a few days in the 4.5s before getting debilitating achilles tendon rubbing problems that went away when I switch back to the earlier models.
The new 5.0s seem like a better overall construction -- the sewn toe of the sole looks like it should be sufficient to avoid the inevitable toe peeling of the earlier models, and compared to the 4.0s you can really see the accumulation of small refinements.
Unfortunately, the heel collar of the shoe seems almost completely identical to the 4.5 to my tendons. While the earlier models had thicker padding and less rigidity in the heel collar, the 4.5s and 5.0s angle in toward your achilles, and are more rigid with less thick padding, causing the rigid part of the heel collar press against my achilles even when I'm not walking.
Width-wise, the 5.0 is slightly narrower -- I measured about 4 inches width compared to about 4.4 inches for the Lone Peak 4.0 and 3.0s in the same size 8.5. It's noticeable, though not terrible when wearing them -- more like wearing a "normal" shoe than the standard glorious toe-spread you'd expect from a pair of Altras.
I'd expect the narrower width to be an issue when hiking for extended periods of time, but I don't think I'm going to find out. Between the heel colar and the width, I'm returning the Lone Peak 5s and continuing my ever elusive search for the perfect wide toeboxed trail runners. I just hope I find them before I run through my stockpile of not-quite-worn-out Lone Peaks.