My gen 1 frame was made from t-slotted extrusion from 80/20 and although it was light and easy to transport, the cross members started to soften at about 100 batches in. I sold the frame and built an SS version which is much more robust.
I sold my frame cheap to a fellow who said he was going to use it but immediately flipped it to a local brewery for much more. So much for trying to hook a fellow brewer up. The brewery now uses it multiple days a week and the frame looks like crap but somehow has not failed. The top cross members look horrible and now have a serious radius, but the main frame was built using a 2x4 type of cross section and that part is holding up ok. I think if I made the cross members out of 2x4 versus 2x2, I might still have the frame today.
I'm glad I went to SS though as it is far easier to clean and will last forever for roughly the same cost.