Ex Beemerboy here
Although I'm not a golfer, my two bits is that you will not be disappointed with the trunk size top up. It is definitely bigger than either of the BMW 3 Series convertibles the we've owned. Even with the top down, there is room for a quick trip to the grocery store.
The real difference is the way the XLR handles, and the way everyone reacts when they see it. The XLR is still a very rare car on our roadways, and everyone's head seems to turn when they see it.
BMW makes very fine automobiles, and have for decades. The XLR Is not only a fine care, but also a SIGNIFICANT car. Why? Because it shows the world that the US can build a roadster that competes with anything the rest of the world can put on the road.
As a former BMW owner (I've had four - two 5s and two 3s), and a current Mercedes owner, I find the XLRs "freshness" stimulates me in a way the Euro iron never has. And for an old fart like me, I can use all the stimulation I can get!
Order it, take a picture and post it here! These guys like Crimson Pearl. I like Xenon Blue.... :cheers