Both the rmini and my iMac have their place in my life, and I enjoy both of them immensely.
For "relaxing", nothing beats the couch in the family room with the rmini. That is where I do my daily reading with the rmini. The New York Times, whatever ebooks I'm reading, etc. Also the occasional browsing of email, stock and weather info on Safari, etc. if I'm in a "read only" mode.
But if I want to do much in the way of inputting info, responding to email, sorting, filing, making notes, researching purchases, ordering from Amazon, making travel reservations, watching podcasts, etc. I always make the short trip upstairs to my home office. Here I have the nice large iMac screen at eye level, a comfortable ergonomic chair, lots of desk space, easy access to file cabinets and office supplies, decent speakers, and a mechanical keyboard with tactile feedback for pleasant typing. When traveling I make do with the rmini for these tasks, but always enjoy getting home to the iMac experience.