the AGO G5 is a multi use vape. it can do herb and oil/liquid/etc. I do not recommend using it for herb.
it comes in sections. mouthpiece, spacer, heating chamber, battery.
the most replaceable part is the heating chamber. it comes in 2 varieties, dry or wax. i recommend using a dry heating chamber with oil/shatter/etc. you may try using a wax heating chamber, but it does not last as long. at these prices i would try both.
the company is quick to deal with, and their prices are very fair.