I've owned my REO Grand for all of 12 hours.
On the PV side I've come up through kr808's, 5v box mods, a variety of vv and mech box and tube mods.
For toppers I've gone through pre-filled cartos, attys, dripping attys, carto tanks, RBAs (gennys and drippers).
My gennys took a back seat to drippers because the flavor was worth the hassle of having to drip 5-10 drops every few minutes. Drippers leak but it is still worth it, the flavor of a good dripper can't be beat.
Then I got a REO /w an RM2. Now I have to go through my collection of PVs and attys and visit the classified section to see if I can get enough for another REO.
REO's don't leak.
Clean dripper taste.
6mL of juice, no dripping necessary.
Able to easily activate the lock with one finger - literally.
More "stock" vapor than other drippers. Of course a lot of this is due to set up, but there's something about the RM2 that makes it easier to get more vapor out of it vs other RBAs if you compare same coil wraps/Ω/wick. It's porcupine magic.
Machined out of block aluminum, you can literally run it over with your car, pick it up and vape it.
It's mechanical, no electronics, wire or solder to fail.
Parts that can fail due to wear and tear associated with anything mechanical can be replaced by the user or sent in to have Rob do it for you if you are not mechanically inclined, don't have time, or are just plain lazy.
They come in a wider variety of colors than any other MOD I have ever seen (that isn't wrapped in colored paper for decoration.) It is a tough, powder coated finish.
Wood versions, VV versions and different sized are available from time to time.
Made in USA.
Retains it's resale value.
Comes with a spare 6mL bottle for quick flavor changes, more available if you want them.
Drives with you nice. In your lap, between your legs, in a cup holder or laying on the seat next to you. 6mL of juice and an 18650 battery you just squonk n vape. No fiddling.
Will outlast many less expensive MOD purchases. Very finely crafted and durable.
If all of that isn't enough, as an added bonus - it's just down right sexy.
It's not a fad, many MODs have come and gone since the REO has been around.
Individual REO PVs have been in daily use while whole product lines have come and gone, and you couldn't get their owners to part with them.
It's not an inexpensive MOD but then it's not cheaply made. I literally could have purchased 3 more REOs had I not purchased the PVs that I have that I was/am not happy with.
I wonder how much I would have saved had I just gotten a REO to begin with? Who am I kidding, I would just have more REOs by now. (but I wouldn't have had a junk box filled with... well broken junk.
Just my 4¢