I have a buggy board and I use it every day.
I have no problem getting ds to stand on it, although sometimes it does involve balancing a toy truck on the buggy hood to get him there.
I don't find that I have to stretch too far or anything, but then I am quite tall, perhaps that makes a difference. Also, I admit the weight is tiring at first, but I got used to it, and now it just seems incredibly light when the buggy board is not there.
Kerbs are not a problem unless they are like a huge step. You just need to give it a bit of a push. Also, there are ramps everywhere here, because the town council got told very sternly that they should do more for the disabled a few years ago, so now practically every pavement around town has a ramp!
I also can't comment on the public transport, as I've actually never been on a bus with the buggy board. I live in a small town, 15 mins walk from the centre, and I just walk wherever I want to go, or go by car if it involves going out of town.
Personally, I'm very pleased with my buggy board, it has been great. I think it largely depends on you and your lifestyle, though.