The Lelit PL53 grinder is also an economical choice. It's smaller, seems durable and people have reported good results for the price.

I mainly would recommend steering away from the Rocky because there are better options for a little bit more money. I would love the rocky as a French Press/Pourover grinder, but it's just too clumpy for espresso. Unless you can find one used for cheap I would look elsewhere. The Gaggia is cheaper, and probably better for the money. WLL sells them refurbished I think. I'm probably just spoiled by my big flat Major.