Before buying the Streetguard 2, I'd strongly suggest you take a look at the ComfortShell suit, also from BMW.
I bought the SG2, and while it is very well made, comfortable and appears it would provide great protection, I found it to be quite warm in temps above 80. I then bought the ComfortShell and have been very happy. In colder temps, it does everything the SG2 does; just add some Gerbings heat underneath and all is well. In warmer temps, the CS is much more comfortable for me. The "adaptive" material really opens up and provides much more cooling than the SG2. Plus, the CS uses the new technology BMW armor.
2006 K1200GT - Graphite