I have both the N900 and a 1ghz Pandora. I still use both and take them on trips in lieu of a laptop.

I think that the Pandora is serviceable as a short-term laptop replacement (i.e., reasonable to use when traveling). It's great at running emulated games and the 1ghz version runs LibreOffice passably well, if you need a productivity suite.

The big weaknesses of the Pandora for me is the poor wi-fi performance. It's so bad that it is recommended that you purchase an external USB wi-fi adapter. Even then, the web-browsing experience (surprisingly) can be painful--certainly it is not as good for me as it is on the N900. Also, build quality could be better.

Again, that's my take on it. I am hopeful that the Pyra will address some of the issues that have plagued the OpenPandora (which is, for what it is, still a unique and fun device to use).