I have the Samsung GT-S8500 Wave now for a month, the Suncase Leather Case keeps wonderful, fit perfectly, the top looks nothing out, enough tolerance in it, that you and the Sound buttons (+ and -), for example, can serve even what is good, up there so the headphones or speaker output is free. Still, it's hard enough that you need a bit rumwackeln while it is falschrum held so that it slips out.
The pull strap also keeps very good, works fine, so far also no problems. A friend of mine has the iPhone4 with associated Suncase bag since the summer, with him, the one leather layer has front solved by the second, but when the wave it is, I think, only one layer leather, hence there is no problem.