Grizzly makes some adequate machines. They are usually me-too type machines that a Chinese factory makes for other companies. Grizzly just orders the off the shelf machines with a few features they want and there you have it. As I said they make adequate machines but not the best. If just ok is good enough then Grizzly is your maker. I have had a few Grizzly machines over the years but I have always sold them and got something better. I am not knocking them but just realize they make middle of the road machinery, not too bad not too good.
IF you are considering buying a CNC Router then you need to figure out your purpose before picking out a machine. If you are going to make hobby level stuff then a Shapeoko will do you. If you are going to go into production then other machines are better for you. The real issue for CNC machines if the CAD/CAM software. There are speciality programs for cabinet makers, there is Vetric Software for 3d carvers. There are countless others like Solidworks, Fusion 360 and many many others but they require a lot of training and a lot of time to master. The pay verrsions of CAD/CAM software is from $300.00-several thousand depending on the features and the number of users.
So figure out what you want, then shop and compare, then buy the machine and the software.