I've used Logitech trackballs for over 20 years now. Been using the M570 both at work and at home for quite a while.
As for keyboards, I've also used various ergonomic keyboards (mostly logitech and MS) for the past 20 years. For the past 10+ years, my keyboard of choice is an Adesso PCK-208B...definitely not compatible with a tight workspace, but it works well for me. Initially bought it because, well, I'm cheap, and so was it.
Awesome thing about having a ergo keyboard plus trackball at home:
Visitor: Can I use your computer?
Me: Sure, help yourself
Visitor (looks puzzled staring at keyboard/trackball combo): Nevermind
Me (Grinning): Suit yourself