I've had my two-battery little Makita for over three years with no problems. The best time to get these is late fall and around Christmas for the best deals. Mine came with four 5-amp batteries and it was around $100 bucks cheaper than normal, plus it had two extra batteries.
I love the cordless, it's so usefull and makes very little noise and no smell, great for late-night buck-thorn bonfires.
I use mine a lot so I loaded up on extra chains, one of these days I'll start sharpening them but I'd price those out as well, at least have an extra so you don't get stuck with a dull chain. Mine are under $15 but it's easier to order them, the off-brands don't seem to fit as well.