I’ve got the plug 3, which is the same geometry but using the lower spec tange infinity rather than the tange prestige used on the plug 5.
I got it as a replacement for a Triban 3, which was a bit too big for me. This is the only experience I have with drop bar bikes.
The plug is heavy, about 1.5 kgs more than the triban with stock predals, reflector and bell, but it does seem more comfortable, probably due to the steel and larger tyres. It’s noticeably slower, but rides well enough, is more versatile and is a nicer ride over the broken road surfaces around here. It’s great for my 34 mile mixed surface commute when I can be bothered to ride in.
If you build it up with better components and lighter wheels it could make for a nice bike, just expect something potentially slower than an all out road bike.