We have an Uppababy Vista, which we bought for DS, and used every day for two and a half years (little monkey wants to 'walk', i.e. be carried everywhere, now). It still looks brand new. We live in the city, and don't use the car that often; it's perfect for lots of walking. If I was folding it up and putting in the car all the time, I think it would be too big. We also live in a very snowy and icy place, and you can lock the front wheels so that it is easy to push without sliding all over the place. It was expensive, but when you work out the cost per day, over time, it is a good purchase. It also came with the bassinet, which we used as the crib until DS got too long (about 3.5 months I think).
liquid, hiccups is exactly what it feels like to me! Another way to describe it is like when you have a goldfish in a plastic bag, and as it swims around, occasionally it bumps into the outside, then you can feel it :) I can feel kicks and rolls from the outside now, too, but of course baby stops moving when DH puts his hand there...
Oh, the heartburn. I am self-medicating with gaviscon and vanilla ice cream...