Just purchased a Sigma Rox. I went for the 11.1 version so I have the option to link it to sensors but I could have saved a fair amount and gone for one of the lower versions (GPS and internal sensors only).
Not used much yet but mounting and setting-up I'm impressed (please with purchase).
I primarily use a Garmin but I do miss a small old fashioned "computer" (speed distance) but on a tadpole bent, mounting those such that they align to get a sensor wireless coverage has proven impossible so went for a similar (to basic bike computer, small) but with GPS.
Also, on tour it does provide limited turn by turn directions. Not tried it yet and it's not mapping based but either in Sigma's own online systems (or through their phone app) or using 3rd party import create and load a route and it will warn you of upcoming turns, just not on a map. Good to have some backup on tour as on France one day I found my Garmin would not take one route properly but showed the trail on it's map but stopped giving and sensible directions (eg "next turn 3769 miles"). Plus I've been careful (and very lucks) occasionally in a supermarket and waiting at the till I realise I've left the Garmin on the bike!