I had a Phil & Ted with the toddler seat. Absolutely loved it with just DS.. once DD came along.. i absolutely hated it. Not practical at all for 2 kids. DS was 23 months when DD was born and he was too big for the toddler seat on the front. He still has naps if we're out and was so uncomfortable hanging on while trying to sleep. DD was underneath and the amount of times i nearly dropped her getting her in and out.. not to mension she hated it cos she couldnt see anything and would sweat her butt off as theres no air flow under there. She could also only lay flat which was terrible for her reflux.
Well.. i just SOLD it! Stupid waste of money it was! I think its just a load of hype tbh.

I have since bought a side by side stroller (Babylove Odyssey) and it the best stroller for 2 kids! Its a little wider than a single pram but honestly ive never had any problems with it out at the shops. Theres always a wide check out open so theres no problems there. DD can now see and i can recline her up a little.. she LOVES it! DS can now also recline back and sleep comfortably. A gf has the same for her kids.. one is almost 3 and the other is DD's age. Shes loves it too.

So yes.. DONT recommend the Phil & Ted for 2 kids, but definately recommend a side by side stroller such as the Babylove Odyssey.

Best of luck with your choice.