Reviews of the AIO tanks are generally excellent
The 40 is a nice size choice and dimensions allow for good viewing and access
Great way to get back into the hobby
You can find these tanks for sale used from time to time on our forum
I say go for it !
I like the idea of everything behind it. I can put it lower to the ground and not worry about a sump. They aren't cheap tanks though.
Probably a safe idea if your worried about overflowing with sumps.