Isnt this the Chicago Electric 4-1/2" grinder? It looks the same and the specs seem to be the same. The price has gone up $3.00 but it still seems to be a good buy.
They also have this newer version which has a 6hp motor that looks good as well but it is priced much higher at $32.99.
I have 4 of the $16.00 orange ones and have only had one go bad - I was using a stripping disc on it and didnt have the disc centered well and it took the bearings out pretty quick. I also had a couple of the Drill Master 4-1/2 griders that I was using with wire rope wheels - neither one held up long.
I also have a 7" Chicago Electric grinder that I use with my shrinking disk and have not had any problems with it.