I've only played about an hour so far, but no complaints yet. I've yet to acquire any fuel tankers though.
I did almost report a bug. I'd had an explorer set to manual, then later automated it. Then, when the design got upgraded, all my explorers except that one retrofit themselves immediately. The one I'd had on manual (but was now fully automated) didn't.
Just as I was about to report the bug though, it finally did go and retrofit itself. Hmmm.