I've only taken mine on one outing to the beach.
Quite like it, dug a few coins fairly deep, even in comparison to the CTX.
It slices like a warm knife through butter in seawater, doesn't seem to hinder it one bit. The treshold wavers, but returns to that recognisable hum no problem.
And because it is a closed coil it tend to skim through the water, an excalibur coil or a CTX coil needs a lot more effort to slice through the water.
Biggest problem I encountered is it tends to stick, create suction when you place it in a puddle on the sand.
I took a 6mm scoop and it easily finds bits and pieces that will slip through the holes.
Switch it on, do a noise cancel, adjust threshold and you're off.
It has a great all-metal sound and you can easily identify targets by their shape if you rotate around the signal.
If pocket money is an issue, then go for an Excalibur or a Sovereign. Great detectors and I wouldn't part with my EXII.
If you can get into the PI side of things, are OK with digging a lot of junk. You'll enjoy your outings with the SDC2300.
I like mine that's for sure!