@Kyle Gutierrez Yes I have. Some weren't that great for PPC, because they had bigger issues with branding and low interest in improving their landing pages. But I've had great success with Search and GDN on a handful SaaS clients.

@Rahul Nishad Lately I've inherited two clients that have active PMax accounts, so I haven't really gone back to Standard Shopping on those ones. I have to experiment a bit more between Standard Shopping and PMax, if I ever get a totally fresh client. But to answer your question; I guess PMax is good as long as you have enough conversions and control (allocating respectively, excluding keywords, etc.)