My slx is nearly 2 years and seems to be working better than ever. It looks bad but comes up nice with a clean, I can see it easily lasting another year. I have an slx 18 thats about 4 months old and that doesn't look as bad as yours but is wearing a little faster than the original slx, however I still think it's going to see 2+ years out easily. The one important think with this pole is looking after it, being careful where you drag the pole hose and if it does get caked in sand wiping it off, then every now and then taking the thing apart and rinsing it through.
Simon.