Not TFE but TF Cloud - I chose because of oa few key benefits:
1 - I liked the workflow it enabled and the streamlined UI since 0.14+ has made it real easy to see what's going on with plans/runs.
2 - private module registry makes it easy to share modules, update and test safely. The parsing of the readme, Inputs, outputs etc is great.
3 - ability to integrate third parties and sentinel into the rub workflow (not doing this yet but on the to-do list)
4 - nice integration with GitHub/gitlab for speculative runs as part of PR/MR
We are using heavily for one product. But for the wider business we are yet to decide whether we should adopt it for all use cases, or just leverage the private registry and use gitlab for the state storage and execution. At ~5k per parallel execution it's not a cheap application but it is brilliant in my opinion.