I was a previous construction worker who used this set maybe 20-30 times with little issue except batteries lasting a shorter period. Recently while attempting to use the drill for my home, both batteries are shot and will not charge. Not being able to find a new battery, it makes little sense to spend $200 on the same crappy batteries that stopped working in the first place. I am now using my Makita.
Pros: works great when it works
Cons: failure rate is very high and no offer to remedy the problem
Read some negative reports on the 36 volt batteries. My experience is - I purchased the $800 36 volt kit in July 2006. It's now December 2014 and the original Ni-Cad batteries are still working - although not quite as long as the used to - but exceptional life (8 yrs) for Ni-Cads. I plan to buy Li-Ion replacements - expensive, but I like the power & runtime of the 36 volt system.
I see only two or three people on here with as High Regard for these batteries, more than likely those few people as i do know you have to charge them up and keep a certain level of charge, and every 5-7 charges or so the 8hour clean up cycle.
I've put my 36's through HELL Quite Literally, i've seen Corded saws burn faster than my 36 same with drills, ya the battery is pricey gotta love ebay i got my extra battery for 129 bucks.
Keep your batteries charged and don't let them fully die, if they're dying put them on the charger which will hot pack it and wait until the battery is cool enough for charging. We'll see how my 20 volt dewalt keep up as far as battery hang time, and for those of you that have 18's 20's and 36's i have all three voltages and the 36 lasts the longest so far as i know, i have not been able to fully test the 20 v max yet.
Pros: Can cut all week with 1 battery
Cons: having to leave it on charger for 8 hours to clean the cells up.