Things you can buy there:
-model train scenics (grass tufts and other plants)
-diecast cars. I had problem with the scale only once. Look for the same product in several stores if you have doubts. Having it in the dream scale in only one place who sell it in the Hobby section together with MLP stuff and ripoff Lego while specialized diecast car stores all have it only in a different scale is more than suspicious.
-sculpting tools: all of these stuff is basically made by China, not buying from there is just paying extra for the middle man. This applies to most other things in this list too.
-RC toy car electronical and mechanical components (they basically sell every toy car Made in China piece by piece)
-decor gubbins: I once bought a set of decoration cogs- great for AdMech bases
-magnets (!)
-bases (!!)
Things better not buy there
-chemical stuff (different safety and quality regulations, etc)
-brushes (here quality maters and it never comes at a bargain price)
-non-sculpting tools: again, quality matters, and while expensive&sh*t exists, cheap&good does not.