Cordless is just so much more convenient. A cordless Dewalt jigsaw is the best tool I have ever bought, saves so much time. I use it for everything, even little cuts that you wouldn't usually be bothered to get the extension lead out etc just to make a small cut. It's easily as powerful as a mains powered one and with Lithium batteries you just top them up and they are always charged when you need them.
Also battery drills are great for using when up a ladder. The belt hook allows you to hook it onto the ladder or your belt, so no need to lower the drill down by the wire. My heavy duty driver is a bit too heavy so that's why I'm looking into getting the smaller Dewalt drill/driver. Should be perfect for this use.
Luckily I can use 240v in my job, but if I was forced to use 110v i'd get fully kitted out with battery powered SDS drill etc. Them 110v transformers are a PITA to move about all the time.