Anyone has experience with mobile printer?

I need a printer that can I can take with me and print invoices off the laptop while I'm on site at a job. So far I narrowed the selection down to the HP 460cb and HP 450cbi . Both come with a lithium-ion battery that suppose to be able to last a few hundred pages. The only difference I can see between the two is the 460cb prints faster, has a few more flash card slots, and has a optional wi-fi card capability.

Anyone here actually used these things before? Or other types of mobile printers?

Thanks,

Jim

Get the Canon BubbleJet BJC-80. It's MUCH smaller and much more portable than the HP counterparts....only problem is you ned an outlet.