I made one of these and it is working very well. the bags are only $3 each and they clean very easily. I thought about going all stainless but after building this I couldn't justify the extra cost.
I put 2 1/2 pounds of hops in it for my last brew and I hardly had any in the kettle at the end. I just let it drain, dumped it, hosed it off and it looks like new.