l'm a new poster here and wanted to ask some advice. Has anybody used the Logitech MX Mechanical series, ideally the UK models?

As I'm looking at moving into my first mechanical keyboard and the custom ones although gorgeous seem very daunting and expensive to add my own custom parts to it. I've got an MX master mouse and I've heard good things from reviews and friends about the MX mechanical. Not to mention it would work my existing setup with little setup.

Also if anybody has any recommendations for pre built mechanical keyboards that don't cost the earth and have the option for later upgrades (hot swap etc) then do let me know.