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Are Zees a worthwhile upgrade from SLX?
Not tried SLXs - have Zees and have had a bit of a time with them 🙁
Great breaks, have 2 sets - on a DH bike a 4X bike. Make sense on the DH, but overkill on the 4X - very powerful!
However... have had 4 levers and 1 caliper replaced due to leakiness, few days ago had them bled at a reputable LBS, the right lever reservoir is now leaking.
Maybe just bad luck, but it's beginning to piss me off.
Edit: I'd still rather have them than Avids 
Weird!! I've never had any problems with Shimano brakes.
Thanks for the feedback.
Cannot recommend Zees enough, haven't had any leaking issues either - so much more power than the Formula RXs that came, as standard, on my Mondraker Summum.
My brother runs Deores and I run Zees. Quite different feeling brakes, the Zees are more progressive compared to the Deores direct 'grabby' feel. Only on proper prolonged DH stuff would I say the Zees are worth the extra, if it's just for mucking about in the woods I'd spend the cash elsewhere.
No, it's for proper DH stuff.
For DH, zee over slx
For proper DH saint over zee