Actually.
Ive tried bike shop tires, tires from K'mart (cheap wall mart) and they all looked awesome. Most lucky to last a few months.
The tire that has lived the longest and does the best job has been the original GM tire.
Most people, like myself, looked at this tire and changed right a way calling them cheezy.
Tens of thousands of KM's later, on a bike pulling 34kg of lead, a bulky MTB steel frame and trailers upon trailer of shopping I am still using the original GM tire and she has some good life left in it too.
Edit:
Unfortunately the rim the GM HBS36R came with lasted a day. I repaired it but I couldnt make it work.
The MP rims are awesome. I use a deep well single wall alloy rim just like it. Solid as a rock.