LOL I'm beginning to feel like the internet spokesperson for this model

but it is a new company and not many reviews out there so I like to give my thoughts to help out.
Canopy actually detaches a little so you can pull it forward. The seatback is pretty high. I'm going to pull it back out of the van in a minute and measure it. I'll try to take pics of dd (3) in it as well. She's about 39in tall.
The Solo is larger and a bit heavier than the Quest but it is also more full featured, with a better canopy (although my quest is an '04 so not sure if newer ones are any better?), nicer fabric, suspension on the wheels and a deeper recline. Also the Solo will not tip back with weight on the handles and an empty seat.
Like you saw in the photos the Solo folds bigger, so a bit more of a pain to carry than the Quest, but usually I have dh with me if i'm in a 'carry' situation so I have him do it

. I've been using the Solo as if it were my only stroller (which is it not) since I got it, and it's been great.
Since you have the Triumph I think your first impression of the Solo might be that it is big. It's a much bigger frame etc. but don't let that scare ya

.
I got a fab deal on mine but I think it's a nice solid stroller that is worth the retail price. Not that anyone should pay retail. I will be taking this on our next trip, which isn't until December, dd with be 4yrs 3m at that time and I think she'll still fit fine.
back in a bit with more pics.