I'm on my fourth Korg PA4X. So I guess I regretted selling it a couple of times.
I had one for a year or so and decided to sell it. Used a Yamaha for a little while and missed the Korg, so sold it and got another 4X.
Then I decided I would like the PA4X76 instead of the 61, so made that trade. Didn't like the 76 so traded it for another 61.
Actually I sold that too and have been using my friend's 4X for a year now. I suppose I'll eventually buy it from him, but not until he asks!!
That makes five of them doesn't it.
During that time I also purchased a Roland EA7, which I still have and like a lot. Also a Ketron SD7 when it first came out and wasn't ready for prime time, and finally Ketron SD40 which was excellent, but I opted to stay with the Korg, and most likely will unless a successor comes out that seems better.