Hi 201418, I've had the Peg perego triple myself for when my 3 were newborns and I actually really liked it. To be honest I'm not very keen on how the buggy looks at all, looks quite 'cheap' if you know what I mean (despite being crazy expensive!), but it was the only triple that really worked for us with newborns? We loved the Mountain Buggy double, as we had a double carrycot and all 3 would fit in the one carrycot whilst they were small, and it was absolutely brilliant for days out to the beach/woods (where the PP wasn't so great). But it didn't last us long, and although the Mountain buggy triple was brilliant, you just cannot use a triple side-by-side to even go to the supermarket... it's far too wide and really not suitable for day to day stuff. Yes the PP felt like you were trying to push the Titanic, but the steering isn't as bad as people would imagine as it has a steering wheel which controls the front wheels. So although it can't turn on a sixpence (like you would with a 3 wheeler), the steering wasn't a major problem? I wouldn't be impressed if a single buggy had that kind of steering, but I guess you have to make exceptions for a huge triple?!
The Primo Viaggio carseats aren't bad seats, and do work brilliantly with the buggy - really handy especially if you have the isofix base. The buggy itself folds super easily - you can have your buggy out the car, popped up and have all 3 carseats clipped on within a minute or so. And really, that was our main reason for the buggy - I wouldn't use the carseats instead of the main buggy seats, but it was invaluable for things like the school run or popping out to the shops when you just need to nip in and out of the car for 10 minutes or so.
We went on to get the ABC triple which I absolutely loved, but the PP was equally as brilliant, just in different ways :)