Not sure about the Bag Boy model you mention, but from what I understand soft sided bags are actually better than hard case models. They are also the preferred type for the Professionals. I use a soft side model, but it was a little more expensive and the one you see at the bottom of your link. The Club Glove Burstproof that is listed at $189. (actually mine was the first model, not sure the difference as that one says it is the 2, may want to see what kind of price you can get on the old model)
A couple things to be aware of on soft sided bags. First the airlines many times will make you sign a waiver saying they do not warrant against damage to the clubs inside soft side bags. Although this doesn't concern me because Club Glove knows this and guarantees to cover against anything the airline will not cover as far as damage resulting while using the bag. I would check the Bag Boy, possibly tells on their website, and if they do not have something similar, then realize you risk not getting your clubs fixed if damaged. Where with a hard case they would I believe.
Secondly, it is a good idea to use something in case they drop your clubs on the heads. Club glove sells what is called a "Stiff Arm" that runs about $25, and have seen them at Dicks Sporting Goods Although I took a little cheaper approach and just picked up a Shower curtain rod for about $4 at Walmart and extend it out inside the bag, which seems to serve the same purpose. So if they toss them on the heads, the Shower curtain rod will break the fall and not my driver.
I personally would only use a soft case as it is much more convenient when I get there to not have to deal with the big case, and just fold mine in half inside the plastic corner piece. Also I would be concerned that with the hard case my bag may exceed the 50 pound limit, but maybe they are lighter than I think? I guess if Club Glove did not warrant for damage I may feel differently. I have traveled about 20-30 times and my wife about 30-40 with this bag and have never had a problem with damage, only my wifes clubs being lost 1 time.
Here is the link to the "Stiff Arm" to give you an Idea what I am talking about, but a shower rod words dandy for me.
ClubGlove.com
edit 1 - Whatever you decide on, get wheels on the bag for the sake of your sanity. I couldn't even imagine not having them on a bag.