You have to give credit to Vmod's for being a Reo enabler.
There are a lot of people - myself included - who go there first to see if they are going to like liquid feed at all. If - and only if - you can get one during a half price sale. Their regular retail price of $124.99 for an XL kit - now with one less battery included - is just outrageous. So yeah, I did that, and then I had my first Reo within 60 days after I got a Vmod XL. Initially for people like me it's the sticker shock issue in context of a vaping technology that has no good comparable. I couldn't get past the price point of a Reo so I tried a Vmod on sale first. In that respect it was worth the 50 bucks I threw at it. It did, after all, get me here.
Is it a knockoff? Errr... not really. The design is very different. It's not trying to be a Reo. If anything - in a lot of not good ways - it's going out of the way to be different. That whole "tip, squeeze and flip" feeding crap drove me insane until I found the post about inserting a feed tube in it so you could actually squonk it upright. And that Tunnel Calamity design with the added chimney and an impossible to fit o-ring. Yeah - that's very different from a Reo.

Even the added disassembly you have to do to swap batteries or fill annoys you (me) over time.
The oval-ish design does feel nice in hand. But the extremely sharp edges on the bottom of the chassis sure as hell don't. I have everything from a 14500 Mini to a Grand and none of the edges on the Reo's bother me.
So a Vmod can be a cheap stepping stone into getting a Reo. But it is cheap and let's just say Vapage customer service is less than stellar. Oh - mine arrived with the chassis pre-cracked. I didn't even have to drop it. They replaced it - and then left something out of my next order.

It can be made to work, but the parts are primarily too lightweight plastic and thin aluminum. You cannot get replacement parts out of warranty if you collapse a spring or the chassis cracks. But they will gladly sell you another one.
Does that sound like a knockoff of a Reo in any way? Hardly.