I HAVE done that quite often, Ian! But never about someone's choice of keyboards, usually about choice of words.
I'm so wishy-washing about changing keyboards, I'm afraid I might have to eat my words if I criticize too much.
I currently have seven keyboards, two Rolands, an Audya a PSR2000, a Casio and two controllers.
Also have HankB's SD5, but only to sell it for his wife.
I've only had two keyboards that I totally didn't get along with, the Korg PA800 that was released with bad sound and a Roland G800 that kept breaking.
I have been critical about various aspects of most all the brands, especially Yamaha's drum kits and vocal harmonizer, Rolands lack of break-fills, Korg's limited fill-ins and lack of styles suitable for me. I dislike some of the hardware placement on the Ketrons, including the location of the pb wheels and style-control buttons, and I also am waiting for more diverse lead instrument sounds.
Thanks for singling me out, but there are lots of folks here who "bite their tongues" and try to post primarily positive thoughts, or at least stay away from getting into the personality-type battles.
Over the years I have been guilty of losing it on several occasions but I generally regret it later.
I deeply respect those who post in a language that is not native to them. I think that can lead to misunderstandings sometimes.
I also appreciate several people in particular who have made obvious efforts to be, shall we say, more diplomatic.
All in all, this board is one of the really tame ones on the internet. I'm extremely grateful for the friends I've "met" here and for all the help I've received.
Even though, I obviously have made by far the best choices in gear over the years.
DonM