I used to sell tents... in a bike dealership. We sold Coleman and Vango tents.
The Vango tent quality was higher, but so was the price tag.
Vango tend to do some budget tents that a good for the money, skip over the middle range and go straight to higher priced, lightweight back packing tents and massive family tents.
Coleman did quite a varied range but the cheaper options were a bit flimsy.
Quite a few of their tents are the same design with different colours and specs.
That Coleman Kobuk Valley 3 is a decent spec, 4500 hydrostatic head, I wouldn't bother with anything less than 3000.
Width is going to be snug for 3, you'd want 2m+ width rather than 1.8m, but 1.8m is good for 2 plus a couple of bags, clothes ect.
The porch is useable, but most of the space is effectively the doorway, but keep everything to the sides and leave the boots and coats in the middle.
I was looking at them a while ago when my daughter was first born as a tent for a couple of nights for 2 adults and a little one but I found a discontinued Vango Gamma 300 cheap.
2 major things to look at:
Pack size - anything over 48-50cm will cause issues trying to get it in hard boxes, meaning you'll need a roll bag on the back seat.
Weight - not so much of an issue on the bike as when you're back packing, but everything adds up.
Proper backpacking tents tend to be the best way to go as the smaller pack size and shorter aluminium poles make them more suited to moto camping.
I have a the old Vango Turini which very similar to the lone rider... these tents are big and lightweight, but tent to be fragile and catch the wind.
I've stopped using mine as I had to replace all the poles due to metal fatigue. When my daughter is old enough to come away in the bike with me I'll likely go back to using it.
My go to tent is the Vango Banshee 300, a very low tent, I can just about sit up in it, but small pack size and weight.
There is also the Vango Pulsar 300+ which I have the older smaller model (Spriit 200+) good porch size, enough head height to sit up, (300+ is taller) and decent sized sleeping area. But it's quite pricey.
I have a collection of tents and they get used for different reasons.
The best addition you can use is a tarp, like Vango Trek Tarp, gives shelter with minimal weight to carry. Good for cooking in the rain or just a bit of shade in needed.