So in theory if you pay $800 for a rondo guitar, it'll be a decent guitar? Sanding a bit off the neck is a possibility I'm thinking, just to thin it out a bit
Depends what you're looking for... For $800, there are a lot of other options on the market, even for sevens.
I've played a couple, and for maybe six months owned a Texan 7 string, which was their take on a seven string Tele. If i recall it was $450 or $499 new, maybe a $100 premium on what a Mexican Fender Tele would have cost me, and it came with an extra string. It played and felt about like a Mexican tele - Not exceptional, but no major issues and it sounded fine. Average pickups but the guitar itself was ok.
Essentially, it was a very unremarkable guitar, aside from its unusual specs, which at that price point is probably a good thing. I sold it because I quickly realized whenever I wanted a singlecoil sound I'd just grab my Strat, and whenever I wanted a seventh string I'd grab my PWH, as both were far superior guitars, and while it was kind of a cool conversation peice (and mine was the one on their website, incidentally), I hate having guitars around that gather dust.
At that price, it's probably going to be fine, but not exactly staggeringly exciting. I'd look at a Schecter C8 of sorts for probably around the same price if you have any reservations when you get it. Rondo DOES have a pretty good return policy, and good customer support.