Hello
Congrats on your twin pregnancy! How exciting. Will these be your 1st children?
I can only comment on the mountain buggy. I got it when the twins were 3 months old as I had bought a huge twin bertini pram 2nd hand which had swivel wheels, suspension and everything which was far too heavy to lift in and out of the car! As a walking pram, the MB is fantastic. You can push it very easily and even with one hand and the children are comfortable in it as it has sling seats. It will go over every bump easily and steers really well with the two in it even up till they are 4 years plus so thats a fantastic bonus. I loved it for this. The things I didnt like about the pram was that the hood of the pram is quite flat and so when my girls began to get taller, say from 3 onwards, their heads used to touch the hood. Also, I must admit that I found the fact that they have to sit right back in the pram all the time quite annoying after a while. As they began to turn into toddlers, they wanted to sit more upright a lot of the time to see out and the pram restricts this a bit as they naturally have to lean back. I think I would have preferred a bar in front as well although i know that the newer ones have this so maybe the design is a bit better now. The other thing is that I personally found the MB quite awkward to get into the back of our car. On mine, there was no clip to lock the pram together, so it went down flattish but the wheels used to spin around when I tried to get it into the car and it tried to open so I always had a bit of a battle and found it hard. It didn't help that I had to turn it around once in the car as it wouldnt fit in exactly.
I think if I had twins again, I probably would get a different pram, one that is easier to fold up and get into the car, and one that sits up a bit more. I have an 11 month old now and I have a silvercross traditional pram and I love it as it has all the features that the mountain buggy didn't!
Good luck with whatever you decide. Its so hard. I ended up with having 3 prams in the end which drove my husband mad. We also bought a maclaren stroller as well and this was a really good alternative as an easy fold up, in and out pram for those short trips or holidays.
Sam