Well, I have a phil and teds E3 version 2. It is a very versatile buggy. I have a 20 month gap between my two. I have used it since birth of DD1, and it has really come into its own since my DD2 has been able to sit up.
You can use panier bags to overcome the small storage issue.
I think it's size is something to think about. We have a Ford Mondeo, so it isn't an issue for us. We either put it on it's side in the corner of the boot if in single mode, with the second seat removed, or collapse it complete with second seat, and remove the rear wheel nearest the front of the boot (simple tent-peg type removal). But we do have a huge boot for a saloon/hatch car.
I am now noticing the weight of my two girls, but I think you would notice 45lbs up a hill in any double buggy.
Being able to fix the front wheel optionally is a real bonus. I had a friend with a three wheeler, who really struggled to steer her buggy in soft ground, etc, but the P&T is no problem.
When the 2nd child is a newborn, you can also attach your car seat to the top of the bumper bar, and put DC1 in the rear seat. Just make sure that you have something heavy in the seating area to counter balance.
We like ours, and wouldn't be without it. It is terrific for the preschool run. I love the way I can go into regular shops without having to worry about my buggy.