Iron Power Source: Rotary Tools, Battery Vs. Plug-In

I'm in the market for my very first rotary tool, however I can't make up my mind between Plug-In or Battery powered.

I find myself drawn to the portability of the Battery powered, while the Plug-In seems to doesn't have the downside of running out of juice during mid project.

For those who already have 'em what have you found you like/dislike about each?

i haTE battery powered tools for the simple reason is that they always seem to run out just when i need them most....save yourself a headache...get a plug in and if you need that much mobility, buy an extension cord...

Buy both if you can.

get the POWER First and Then go for portable when you Need that!

Get power with a cord, you'll be much happier. Rechargable batteries never seem to last real long.

Thanks for the input guys, in the end I went with your collective advice and picked up the Dremel 400 XPR tool set at my local Lowes. Now I just need bits and some stone to get some practice on. Wish me luck.