Has anyone worn these for a long time without durability issues? I see a lot of reports about the upper becoming unglued/falling apart quick.

I bought two pair. Prio and the 360. Took a trip to Albuquerque and the first pair (prio) didn’t make it a week before the sole started to come unglued. Xero was surprisingly not helpful with getting the pair replaced. I decided not to buy from them again. However, the other pair 360 are going strong enough after almost two years as a mostly gym use shoe (lifting, boxing, martial arts, running) that I’m considering another pair. They almost look new and have hundreds of running miles on them. Still haven’t decided but we will see.

How do these feel for people with plantars?

If you're referring to plantar fasciitis, we don't claim to improve any particular condition. Although, many of our customers have reported reduced symptoms from incorporating more natural movement (using natural movement footwear, aka Xero Shoes) into their daily routines. Our shoes and sandals are designed to allow the feet to move naturally. Many have said the body has a tremendous capacity to heal itself when it's allowed to function naturally, but there are many causes for plantar fasciitis and no magic formula works for every person. The best thing would be to consult your primary healthcare provider.