Love my little iRobot! Cost was $100, with the 8 GB MicroSD card. Upgraded to Android 2.1, it runs fast, efficiently, lasts about 8 hours on a charge, and is a great form factor. It’s a 7” screen, so easily held in one hand, weighs about 300 grams (about 1/3rd of an iPad), and has plenty of power and features for what I need.
Being able to share memory cards with my phone and digital camera is great; no need to hook up cables or to my computer to move stuff around. I can use the built-in 4 GB of FLASH in the iRobot as a swap drive if needed, but honestly, with the cost and insanely small size of MicroSD cards (I think I have a few extras in my wallet, with my 3 international SIM cards), it’s easy to carry 64+ GB without even knowing you have them!
The lack of a memory card slot in the iPad is a show-stopper failing for me (even before noting that it's obviously a method to enable Apple to charge an extra $100 for 16GB or 32GB of additional memory -- the latter is overpriced and the former is downright highway robbery).