I think it depends on the window (or door) itself. Fortunate (or unfortunate) I did a rough count and I've installed contacts in about 30K windows/doors easily (15K in wired screens alone).
I've used Micras since they first came out, and the big sticking point for me has always been the odd shaped magnet. If they included a standard round rare earth (like those that come with contacts) rather than (in my cases) necessitating a replacement to be sourced, which adds to the overall cost/bottom line. In the case of a vinyl window, drilling is still drilling and it's can compromise the weather integrity. Ion's pictures and videos show a nice, pretty window with a double sill that drains to the outside, however in the wild, not all windows offer such and usually, unless you get a manufacturer's rep or cut sheet on the window, the level of compromise (if any) can't be determined until the hole is there.
The plungers are decent, I've had some pre-production GE units on my desk for eons, since I usually use Honeywell versions. I think they started making them with a flange like standard plunger contacts since then.
By far the best sensor that I've seen and worked with is the OEM one that Andersen is installing and producing that is Honewell 5800 series compatible, monitors the state of the lock in addition to open/closed. Andersen also is the only window manufacturer I know of that offers OEM installed hardwired contacts that don't void any warranty, but it's been a long time since I've seen/dealt with those in the wild.