Hi and welcome to the forum, Sedona.
Because I switched to acyrlics (for my primary paints anyway) about 3 years ago, and Vallejo has become my brand of choice, thought I'd chime in with a couple thoughts.
Most of the reported Vallejo problems I've read boil down to folks playing Mr Wizard and mixing Vallejo with one household product or another, presumably to save a buck or because of lack of local availability of the branded products, as you mentioned (both are perfectly valid reasons and I am NOT throwing stones at those who choose to do so)
Most of the negative stuff you've read is probably folks using alcohol to thin and clean. Don't do that. Vallejo isn't Tamiya and it's not alcohol based. It'll make a gummy mess out of your airbush. That's what I think you've been reading about.
If you simply must use a generic product, and you don't want to try the Createx being tossed about above, try maybe Windex. I cleaned and thinned with it for a while, having fallen prey to stuff I had read online (not necessarily here, mind you). I'm not recommending it, just saying if you gotta try something....
FWIW, I use 2 products in conjuction with my Vallejo Air and Vallejo Model Color:
1. Vallejo Airbrush Thinner (not thinner medium) for thinning both model air and model color in airbrush
2. Iwata Medea Acrylic cleaner (because I bought a big bottle of it years ago). Vallejo and Createx work great, too.
Hope this somehow helps, I'd just hate to see you get discouraged with Vallejo before you give a fair go, and I'm just afraid if you start mixing stuff, that's what is going to happen.