G'day justcrusin32 they are really well known for being one of the better models to fish out of, tried & true. They are really stable because of the low seating position which also means that yes, you will get a wet bum.
The secondary stability is very good, so you would normally have to try pretty hard to fall out of one. I have only fallen out twice, once when playing silly buggers & once when some showoff was showing me how to "edge" my kayak, ie lean it on it's side. :lol:
They are relatively fast because of the long waterline & relatively narrow width. They are definately faster than say a Swing or a P13. That said, they are harder to turn if you are noodling around in small creeks, not that it has been a problem to date.
I am approx 95-100Kgs depending on the weather & have no probs with this kayak taking my weight+gear. If you are a big guy with a fatt butt, I'd test the width of the seat before you buy though.
$650 is a great price, even better if they have any accessories like a paddle or pfd thrown in.
I don't reckon you'll go wrong buying one mate. I have never seen a bad review for them.
Here's a link from a US guy in the States who reckons the same:
Here's another link for you with users reviews:
I'd still get out & test one if you can but I think that you will be pleasantly surprised. If you are worried about the stability, try leaning it over as far as possible & do the same with some other boats. You may end up wet & looking a bit silly if you go over but it will give you a good idea what it takes to tip them.