Even the RDL version of the Stagg has problems, but if the camber is not there, it is possible (but a bit expensive if you cannot do it yourself and probably a lot of work) to make the camber if it is not there (or worse: if it has an inverse camber).
The trussrod does nothing to the neck bending.
But for the money the only alternative is a Palatino or an Ergo.
I got a cheap RDL neck and that had the inverse camber, so I'm removing a lot of wood to get a camber to avoid buzzing. One other Stagg I have has a completely straight fingerboard (which buzzes) and another one has a little bit of camber (some buzzes if plucked harder).
So if you have the chance to select the instrument in a shop, press the string down at both ends of the fingerboard and look if you see some space around the neck heel between string and fingerboard. If there is no space at all, better don't buy this instrument, because it will buzz easily in the lower positions.
If you go to a luthier expect half the price of the RDL for the fingerboard setup.
If you want to bow, the bowing angle is rather small because of the low curvature of the fingerboard and bridge. Also the strings could have a wider spacing at the bridge. Best read the Stagg megathread(s?) before you buy such an instrument. It will show you what modifications might be needed.
