It has only been a few days now with my new 505 but I have realized that I will quickly wear out my 501 Jeans if I don't get some knee pads (They will stay much cleaner too). Maybe the Easter Bunny will brings some? Today I went out in the back yard for an hour and found a quarter and 3 pennies. I am still amazed that when the 505 says 25cent.. that I actually dig up 25cent! I also left the knee once to sit down and sift through a pile of dirt that held a positive for metal (read 1cent/10cent) This 505 has made be a believer and after going through my pile twice I came upon a small pendant of what looked to be a mouse. My daughter confirmed she once had one (pendant) when Ben was a popular Movie/song. She took it back, said thanks Daddy, and gave me a kiss on the check. Life is good.