Does anyone use these plastic sand scoops? They have my interest since you can scan them for metal. Plastic isn't as heavy as metal either which is another plus. Do they work well? Do they last? They are all over ebay for about $18 to $20 after shipping. I'm also looking at the stainless steel ones which cost about twice as much but I wonder if they are overkill for me. I am probably not going to be doing sandy beaches as much as other types of ground. I appreciate your comments. Thanks!