Just got my M400 and used it for the first time. Very impressed. Cleaned very well, easy to use, etc. I made sure to properly clean it out after use, coil everything neatly, and I have it on a caddy and inside a storage bin when not in use to protect it from the elements. My question is, how durable are these things in the long run? How do the parts hold up against chemically treated water over time? How durable is the entire unit, say if it was accidentally dropped or fell off the caddy? Just curious, cause it seems pretty rugged, but don't want to take any chances, considering the price tag on these things.