Don't worry about the weight just ride it. I bet its still alot lighter than the cruiser you have. =)

Hopefully you found a saddle that works pretty good for you.

Compared to your cruiser most road bikes will seem pretty harsh. I used to feel that way about road bikes, but the last few months I have commuter mostly on road bikes and you kinda get used to the feeling a bit and also do alot more unweighing of you body over bumps etc. Its fun to gave a couple bikes that are different from each other.