I've been using one for about 8-9 months, only problem was the tip came off, put it back on with a poly sealant which also waterproofed it. Maybe not the best out there but it does what I need of it. Gets 1 1/2 - 2" depth. Bought the others for a spare and a gift.
I got one of these recently and it works pretty well. It's a wicked deal for $15. I got the last one on the shelf! If they are getting rare it may be because they are being discontinued, so it might be a good idea to snag them up as soon as possible.