I have two Discovery 2200's, picked them up on sale at a local big box store earlier in the summer so my wife can get out too. Simple to use, fairly accurate on depth. Have had reliable hits at least to 5 inches. Sometimes the display shows deeper when it may not be. We run in all metal mode as Canada clad can be shown as iron, so if your not adverse To digging its great for the money. The tones are set and no volume adjustment. Very light to swing with a large display (no back light). Ground balance is factory preset and there is no GB adjustment. It does not do well in wet sand giving a lot of falsing at least in my area. Does great in parks and dry sand though. No static pinpoint function its a move to detect MD and you need to X the area to get final location, Get a propointer to go with it. a pinpointer really helps. The coil is waterproof and can be submersed in water, the control box cannot. The shaft is two part with cam locks, nice to keep the shaft rigid at the connection. . Takes two 9V batteries.
For the money its great, does the job and at the price there is no worries about it being bounced in the back of the car. The only down side with two is we have to work a fair distance apart or they do interfere with each others frequency.
For a starter MD I am very pleased with them.