I have a dewalt corded, milwalkee corded, and a porter cable "tigersaw" corded, and 2 battery dewalt sawzalls...
The milwalkee is the best deal for the money in my opinion, it can usually be found on sale for 99.00 bucks at the depot and has a higher amp motor then the dewalt of the same price. My potercable is mega old, and a higher amp then the other 2 so I dont count that in the comparison but definitely out works the other 2 and has proven its self to the test of time and abuse. The dewalt cordless are good for quick jobs and farting around the house with; cutting pvc, pruning tree limbs, cutting up stuff so the wimpy trash men can lift it... but the batteries dont last but an hour or so, so I cant use it on the job if I know I need the tool for more than a few hours.
My advice for buying tools is buy the best you can afford, and buy brand name. I always buy tools that are over kill for what I need, but it sure does come in handy for that special occasion when you really need it. Also if you have a grainger, or fastenal, or a commercial supply house near by, their power tools are usually built to a higher standard than the home cheapo versions even know they both say dewalt.. but expect a higher price.