I have VFF Sprints and no longer wear them often.
I've done a few short/easy backpacking trips in them, for which they were fine.
But anything is fine when you're only doing short, easy trips.
But for trail running, which I do at least 4 days/25 miles a week, I don't like them. One lapse of focus and you've got a broken toe. I far prefer a closed footbox- kick something and the impact is spread, more or less. The Sprints, with an open top, also let too much dirt/rock in. I also find VFFs to be very hot/sweaty compared to other shoes. I don't think they breath well.
My two favorite shoes are the New Balance Minimus Trail and MT101.
I've got about 200 miles in my first pair of Minumus, countless miles in MT100s/101s. The Minimus is pretty similar to a Merrel Trail Glove, but I believe has a little more thickness in the heel…which I think is better for high mileage, but probably not too significant of a difference. I tried both; the Minimus felt better to me.
I think the MT101 is a great distance shoe if it fits you- it's getting thicker in the heel than the others, but has what I believe to be a great rock plate, which I find important for backpacking long miles. I've done many long backpacking trips in many different pairs of MT100s/101s. I think their durability is great, considering they're a lightweight shoe.
I think Nick Gatel and some other runners I know were far ahead of the "minimal" trend because of their running backgrounds. Nick's son is also a competitive runner. In the running world, flat, lightweight, sub-7 ounce shoes have been popular for a very long time, especially amongst racers/XC runners.
I think it's funny that people talk about "fad" with minimal shoes. There's nothing fad about it in my opinion. If anything is a fad (historically speaking), it's probably giant, overengineered "shoes" with soles like marshmallows.
I think the general public is merely catching on to what XC runners, track athletes, and many other racers have known for years; a flat, minimal, lightweight shoe promotes better form and speed. Show me a fast, elite runner that lands on their heels.
There's a reason for that.
I think our pal Nick G. has been a little ahead of his time concerning backpacking footwear. I know Nick has experimented with many versions of racing flats over the years, including Asics Piranhas (road racing flats, 4oz. each!). Some of the most popular out there are the Saucony Shay XC and the Saucony Kilkenny XC line. I did a ~60-70 mile, +/- 20,000', 2.5 day trip with him…I believe he wore some Shays. I think that's bold…if you've ever seen Shay XCs.
Do the benefits of light weight, flat shoes cross over into backpacking? I think so, mainly in weight, stability, and fast drying. But there is a key difference, in my opinion: When running in minimal shoes, you have to run with a mid-forefoot strike. But when you walk, it's typically heel-toe. Heel-toe form prevents your arch and Achilles from taking shock out of the landing- impact goes more or less from your heel to your knee. That's why I prefer the MT101 for backpacking; there's enough heel there for shock, but not so much it's unstable.
I love minimal shoes, but I think they're better for running. Add 20 pounds, a walking heel-toe stride, and plenty of rocky/sharp terrain, and you're looking at added leg/foot fatigue/pain…not what I want when I'm walking 30 miles in a day. Can you adapt? Sure. How long do you want to spend doing that, to what end?
For short trips, anything is doable…go barefoot, wear flipflops…I'm mainly talking high mileage (20+) consecutive days.
It ultimately depends on what you're doing and why you're doing it.
That's my take on it all.
Whew.