I agree the treatment/comments were a bit harsh - especially as they were in the open (and I'm not scared to put my name to my comments!

)
I think it may partially be due to them trying to defend John and his product because of some of the comments on here questioning the design/reliability of it and were trying to protect one of their forum regulars. However, I'm not convinced there was a need for it personally. Both products ultimately do the same job but are different concepts and people will chose which suits their needs and pocket the best.
Personally, I have the 110v Competition Heat one and am very happy with it.
I already run a gennie so running a 240v-110v converter is not a major problem. However, 12v is generally more convenient over here and small 12v to 110v inverters aren't very common and it would still be something extra to carry....so I expect John's will be very popular on those grounds. It also has the big advantage of John's being UK based, and as a result the end cost being a fair bit lower (mainly due to the international shipping costs and import duty/VAT that we get hit for - I think I got hit for about £22 in fees before ParcelForce would release my heater - this was mainly their handling fee that they charge for charging me the VAT on behalf of the sodding Government!!

).
From what I have seen (haven't seen John's up close yet), it does look very good....however, personally, I prefer the more compact design of the Competition Heat one as I already carry loads of stuff and want/need to condense it down! (although admittedly it isn't very compact by the time you add the converter!)....now, if a purely 12v one was available....I'd be very happy!
Hopefully everything has calmed down and I wish both companies all the best!