Currently using a Psylo SL on my bike. I'm quite impressed with it. If I had my choice, I would've purchased a Marzocchi, but as the Psylo came with the bike, I figured I keep it until I destroyed it or had some extra cash. It's held up very well, and I have 0 issues with it. I'd recommend it over the Duke!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger