I run in the Mesh version. Compared to most modern running shoes they are very light and flexible. Not as light as Mizuno Universes (racing flat) but to be fair they do have more sole and more durability then the Mizuno's which I really like.The problem with the Mizunos is they have all these gaudy numbers on the mesh uppers that look a little funky on the road for training. The Blue Mesh Mexico 66s don't stand out at all and look passably modern. Only those who know their running shoes looking closely post run really notice they aren't "normal modern" shoes.
As for feel & feedback they won't come close to Vibram Five Fingers ELX (which are great if just looking for more mileage and protection then straight up barefoot). The Mexicos do have a very minimal drop, but it's nowhere near as bad as modern shoes which after learning to run barefoot feel like your running in high heels. Plus I got them on sale for $35. Not bad.
I hear where your coming from. Running barefoot is great for learning natural running form but it does limit the distance and pace at which you can run. Running in minimal shoes allows greater distance and faster paces without loosing that great ground feel or degradation of running form by having your feedback loop deaden by layers of foam.
Just a few years ago we had such a great selection of minimal shoes. Learning to run barefoot cured me of my shin splints by teaching me how jarring that straight leg pole vault heel strike running form is. It forces you into a natural forefoot gentle running form landing lightly under your body just ahead of your center of gravity with bent knees and letting your legs absorb the shock not some piece of foam.
Now the industry is back to high heel foam & gel shoes again. Even Five Fingers are all thick and stiff with only the ELX offering that very minimalist feel (even more so then the originals!). Sigh... but as the runners and the industry have gone back I have found and an unconventional answer.
If you can't find a pair of Mesh Mexico 66s I would recommend trying on racing flats. They are very minimal & have great ground feel with minimal stack heights & heel drops that allow longer distances and faster paces without loosing that great ground feel. They also look for the most part like regular running shoes that won't look out of place or get stared at like running barefoot or Vibram ELXs.
Racing flats are hard to find but well worth it if looking for minimal running shoes for road work. For off road trail shoes look for spikeless cross county training shoes. They also have that minimal running shoe feel with minimal stack heights and close to zero heel drops. Also for the most part they look like any other trail shoe. Only those who know shoes well (like my buddies that work at the local run shop) looking very closely post trail run will notice they are not typical trail shoes and ask about them. The only problem is they are only available during cross country season so stock up in summer or very early autumn. The problem is they are limited runs on highly specialized shoes so selection and sizes are only abundant early in the cross country season. Once they are gone you'll have to wait until next summer.
Hope this helps.
-Rey