I'm not sure which of those is the same model, but I've got a Grizzly G0704. Probably the 20 model. I feel like it's a great choice for someone without a lot of space, a ton to spend, much experience with mills or as a CNC platform. Definitely has it's issues, but I've made some nice things with mine.
Tramming the head properly is challenging, and the handwheel dials are oddly marked at .02". The fine feed doesn't feel very solid and the column lacks rigidity. But, it's inexpensive, runs on 120v, uses R8 collets, doesn't take up much space and has a ton of guys doing cool mods you can copy. I've decided to move up to a larger mill, but don't regret buying mine. I've used Bridgeports in a classroom setting, but can't get one in my garage. This was a good starting point for home ownership. You can check some of it out at G0704.com.
One thing to note is that even though the machines may look the same from seller to seller, they often have differences you might care about. If you're like me, you often don't appreciate them until you actually begin working with something. I have no idea if this helps at all, but best of luck.
-Ryan