I am not an Apple Novice so:
That piece of software is lethal. Be VERY careful when you decide to install it. It wipes out all software which was supported by Snow Leopard, stuff like Photoshop CS4, Illustrator CS4 etc. It appears to be Adobe's stuff gets hit hardest.
It is also a RAM hog and should run on 2GB of RAM.
Worse of all, the only way to get it is from The App store and NO refund once you find it sucks.
IF you're silly enough to install it, make sure you have a full back- up through Time Machine and that you have a Snow Leopard DVD handy.
I am staying put at 10.6.8 and they can forget about any further support from me.