Go for it.
Lubuntu is getting much better each and every release. I remember I had lots of issues with 10.04 and I didn't get the same problems with 11.04.I think the Lubuntu project will be absolutely stunning by the time they reach 12.04.
I have joined LXDE and Lubuntu team recently. Actually, we can't talk about them apart.
I love LXDE and Lubuntu. I'm quite sure it will be much better in the coming releases.
In fact, if you take a look at www.distrowatch.com, you will clearly notice that Lubuntu beats Kubuntu and Xubuntu.
My PC is 6+ years old and it has no problem running Unity 3D but I prefer Lubuntu.
This is a test PC and I'm installing many Distros for testing. Planning to get used laptop and once done, Lubuntu will be my MAIN OS on that device.
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