I bought the Ritchey WCS Alloy 2-Bolt seatpost and have had nothing but trouble getting it to hold my saddle in position.
It's difficult to adjust the saddle tilt because as you tighten the bolts the tilt changes.
I've torqued it to the 16 nM spec, slowing going up in torque one side at a time.
On a ride it tilted up, so I kept tightening it, it stripped.
I got a new top clamp assembly. Still having problems.
Ritchey sent me some red torque stuff, I scuffed up the post and assembly, lubed the rails and holders and still not holding.
Ritchey offered to sell me another post at "Team Pricing"
But, why would I spend more money on a product that has already failed?
If this was a Bontrager or Thomson post, they would replace it...if it even failed to begin with.

Has anyone else had issues with this post slipping?

I have used 3 of them on 3 different bikes. No issues.

The Ritchey pro and comp seat posts I had always changed angle when I hit a hard bump or something. I'm not a fan of that design. If you need a setback post, I recommend Race Face Cadence or Deus XC. Best clamp design for setback I have ever come across.

Keep in mind, we're talking about a seat post here. I don't know about you guys, but I don't want to have to screw around with it like the below statement. Set it and forget it.

Here is the reply I received from Ritchey:
When faced with a slipping seat post clamp please disassemble the clamping assembly and clean all of the surfaces including the saddle rails and bolt threads with rubbing alcohol (I personally use 91% or greater) or Acitone. Before reassembly lubricate the binding bolts’ threads with grease like Pedro’s, Park Tool, Finish line or your favorite. The critical step is to also lubricate the clamps (both the rail clapping surface and surface that binds to the post) with light layer of Ritchey Liquid Torque or other “Carbon Prep”, below is a link to the Ritchey Liquid Torque properties and instructions. Liquid Torque can be used on both Alloy and Carbon and reduces the torque needed to for clamping by up to 30% it also creates friction between clamping surfaces.. You can purchase Ritchey Liquid Torque from any authorized Ritchey dealer. https://www.ritcheylogic.com/media/Fi...quidTorque.pdf It is also very important on 2 bolt clamping systems to equally torque the bolts up to 16nm, “walking” the amount of torque up to 16nm. Please note if the saddle is not properly installed on the rails (too far back or forward it may cause slipping). Please always see a Certified Bicycle Mechanic if you are having issue with any components, they will be able to instruct you on the prober installation and diagnose issues that are impossible over email alone.

That's why I recommend the RF, set it and forget it.

Wow....your the first person I've ever heard having that issue with a Ritchey post. I intentionally buy these for all my bikes, I love them. I've had four...or maybe five of them from the Comp to the WCS versions...always rock solid and never slipped. And I'm not a light rider either.

Get the WCS single bolt setup. One of the easiest setups to adjust period. Won't slip because it can't. I have it on my cross bike and come down on the saddle hard a lot. I did have the cheap Ritchey 2 bolt on there (came with the bike) and it did slip when I'd eff up a bunnyhop and nail the seat, so I got rid of it because it was a boat anchor as well.