I have had a few and dropped a few ( Roofer ) My review is
Panasonic = crap dropped only once from single storey fell apart.
Hitachi = crap lasted two drops from single storey but now only works on slow
and the radio blows chunks
Dwalt = best so far two single and one double storey drop still going hard.
great radio
To summarise .......... dont work below me 
haha Roofer too finger(bone)
my panasonics had a few drops 1 story onto concrete no problem. I think it's just the luck of how it falls. Love the Bosch radio heavy but it cranks.suppose to hand a fall from two storey not willing to test it though
^pneumatic tools are a good option if you're doing heaps of marine work. although you still need a genny and compressor.
and i know what you mean about dropping gear in the drink- there is a few hundred dollars worth of my hand tools scattered around the bottom of exmouth marina...
^^^ I cut through the lead on my circular saw a few times & even had the end of the lead weld itself to the blade! My Makita planer has a 5" long lead for similar reasons - easy to check & tag for the sparky.
We use a brand called WURTH MASTER there the bomb and can handle all the **** us fitters give it ive even used it to drill a 22mm into steel after a 5 mm pilot and she didnt even smell like burning contacts.
Was using it tonight to get some corrosion off a shaft so i could pull the bearing off.heres the state of it.
Annoyed by constant flat battery for my power tools , few years ago I did convert some to use external power bank.
Lithium battery from my electric bike 24v 10Ah require me now to recharge only few times a year.
Some of my drills come with 2 NiCd batterries and already dead- so I removed battery and soldier an 2m extension cable with cigarette lighter plug.
Cigarette lighter socket is attached to battery.
Small inbuilt electronic controller allow to set-up any voltage from 0 to 24V
Now I can work as long as I want without worrying about flat battery. Drill is even lighter to handle without battery, just need to carry this battery bank near to the work place.
I suppose the future for all battery tools is now additional plug and cable the could connect any tool to small battery bank. Tool is still portable and never will run out of juice.
Millwaukee
When buying cordless tools ensure its min 3.0 amp.
The crap that you get at bunnings is only 1.5amp
You will need to go to a real tool shop or ebay
