The OEM of TK is not one ever mentioned in Mechanical Keyboard market. Its quite funny as they have done several popular boards and manufacture one of the biggest hyped releases recently.
Moving away from that, iOne was actually not an awful manufacturer for us. The Pro unfortunately caught a bad wrap because we went with a snap method on the USB connector which required quite a bit of force to plug in.... In certain regions (Everywhere except North America) this was considered a really nice and secure fit/feature. The market here, was unable to plug in the keyboard properly and thus we had a "DOA" failure rate which was astronomical & deadly to the boards lifespan. In actuality the boards were perfectly fine.....
Also, iOne is really an automatic "NO" in the keyboard forums/dwellings we frequent and market to. We are constantly gathering feedback from our user base and make changes based on wants/suggestions (Hence the change in QF Rapid Branding), we decided it was no longer smart to work with a vendor which was not respected by the community we try to please.
As for all the boards you listed, it comes down to what feature set / form factor you want...
Personally, I use a Rapid & Trigger depending on where I am. (Home or office)
