FTX Global is quite excellent I find, but of course it's a 'generic' add-on, meant to spruce up textures over the whole world, and of course it doesn't provide vector data for coastlines, roads, rivers, lakes, or what have you. It also doesn't provide landclass improvements: if an area in your sim was wrongly depicted as desert or what have you before, it'll still be the same after FTX Global is installed. It's also not without it's faults; I live in western Canada, and I can assure you that FTX Global doesn't do a good job of replicating yellow wheat fields...
Regardless, for an overall improvement, it's quite good.
Once you add in a vector product (FTX Vector) and a landclass product (OpenLC), the overall change is huge.