Anyone have experience with Pubstack

I’m revisiting a shortlist and would love publisher-side experiences with Pubstack as a managed or semi-managed Prebid wrapper. Not fishing for a vendor pitch, just looking for practical pros and cons.

Helpful angles:

• Onboarding effort and time to first auction
• Support quality
• Performance impact vs your previous setup (eCPM, fill, viewability, latency/CLS)
• Tooling and control: floor pricing, A/B testing, analytics, versioning, bidder control
• How they handle multi-site or multi-GAM environments
• Interop with AdX/Open Bidding, Amazon TAM, identity solutions
• Commercials
• Any gotchas or things you wish you knew earlier

If you can share ranges rather than exact numbers, great. All input is appreciated.

Thanks!