All depends on what you need and are willing to pay, remember somethings you get what you pay for.
I would bet it is R1 unpolished or unfinished black hose, they don't last as long from my experience.
I perfer 100 foot lenght of R2 and polished or smooth finish, blue seems to last the longest.
I have two 50 foot length, one is the orginal and has never been used, the other is R2 blue and when I need just a little bit more hose that is what I take out and connect.
Is it a good buy, hard to say till you add the shipping cost and check around locally. If you want to know if I would buy from Envirospecs' sure, have before and would again but they need to stop marking up the shipping cost. ( Last order seemed way to high for UPS, could have sent it Parcel Post and cost less and arrived sooner, my opinion).