We put the call out to random volunteers, as well as our regular streamers who test builds, willing to test the TBM every time an update gets built. The last callout went out today.
They are definitely thoroughly tested. Going by the number of support posts here, compared to the number of sales, these errors are isolated to a small group of people. Personally, I have yet to experience an exception handler error, but I also don't have many plugins or ortho installed, so the error could be anything from a PC build to corrupted scenery being installed, to a rogue plugin (free or payware).
If it's really getting frustrating for you, you could install a completely clean, scenery free, plugin free installation of X-Plane on another drive. Then if you have a crash with ANY add on in the original install, simply install that add on into the clean X-Plane, and see if the crash happens there. If it does not, then the problem lies with your original X-Plane installation. If it DOES crash in the clean version, then it's the aircraft OR X-Plane itself, in which case we do a follow up and either fix the add on or provide Laminar with a report.
With aircraft getting more and more complex, it might be an idea to have those 2 X-Plane installs as a just in case. I have 3 of them.