I've got two separate Arlo setups, one with two cameras running in a remote location with no fixed internet over a 4G modem and one with four cameras at home. All the cams are the first generation wireless ones.
They're very good from the ease of use and setup point of view, but do have their limitations. You have to remember that they activate like a PIR sensor for an outside light and there is a small delay before they start recording, so they can be sensitive to placement. Anywhere that something fast-moving (e.g. a car) is going to be out of their field of view before they start recording isn't going to work too well.
I have the original basic Arlo cameras, not any of the Pro range, and I'm perfectly happy with them. The image quality isn't the greatest but it's perfectly acceptable. You can do some useful things with them like configure them so that if one camera detects motion then it can also trigger other cameras to record. They also do geofencing so when you go out and leave the geofencing zone it can change mode - useful if you have a camera indoors or covering an area you don't need CCTV for when you're at home.
Essentially I'm very happy with them. They're far from perfect but they are an absolute piece of piss to set up, the cloud service is free, the smartphone app is pretty good. If you understand their limitations and are happy to work around them then I'd say they're good. The first gen kit is getting very reasonably priced on Amazon at the moment now too - although if they're going to be triggering a lot it makes sense to get rechargeable batteries for them.