I think it would depend what exactly you are using the wheeled bag for.
For example, if it is you doing the handling and it is just for back and forth to class (friend's house, etc) I use a wheeled cart that is for scrapbookers (because it has lots of pockets!), but if I have any further to go I use the Bernina case that came with my machine and a collapsible luggage cart (it has attached bungee cords).
I have to admit Precious doesn't leave the house very often! :shock: I think if she did, I might invest in a purpose built bag for her.
Which brings me to the rest of my point. If you are going to be travelling by plane or train, or if the handling of the machine is mostly going to be done by someone other than yourself, I WOULD invest the money in a good rolling cart.
Jean in Windsor, ON