It is a good detector. It was Charles Garretts goal to put the most modern electronics he could into a $200 detector. He managed that.
It is capable and functions well and is better than some in the same beginners niche.
I also own detectors that cost 3-4 times as much as the ACE 250. I will be the one "spoiler" among the Garrett cognoscenti and say that there are detectors that surpass it, some at only 2 times the money. So don't think that the hype behind the ACE is all there is to it. Even Mr. Garrett has written that once you set your budget, try to save $100 more and get the next model up. So if you can afford it, get the GTP 1350 - it is everything the ACE 250 promises to be.
If your budget is $200, give or take, get the ACE 250. For the money it is at hard to beat.