ITreviewed posted a review on the PlanOn Printstik PS910 Mobile Printer

PlanOn's Printstik PS910 is a well built printer that does what it says on the tin. It's not colour, so won't appeal to photo junkies, but business people needing to print spreadsheets, receipts or other such materials could find it a lifesaver. Print quality and print speed aren't great, but if you're not in a hurry you shouldn't even notice. Text is a bit fuzzy and even at the highest quality setting images are very pixelated. Moreover, the pages curl up the way thermal-printed credit-card receipts do. Finally, running costs are considerably more expensive than most laser printers and inkjets, and you can't use whatever paper you want (say goodbye to company letterheads, etc). Currently, the PrintStik works only with Windows computers and BlackBerry phones, further limiting the use of this relatively expensive peripheral.

PlanOn Printstik PS910 Mobile Printer Review