I think its great, I use the XLR module with the S5 all the time for quick sound bites such as a real estate agent doing the intro voice over, modelling interviews, product reviews from YouTube content creators, etc. I almost never need more than one channel, two at the most and all of my higher quality mics are XLR. I can also shoot long form such as speeches, conferences, etc and the whole setup is still more compact than my C200.
I have the MixPre6 and its a PITA, it needs another power source, just remembering how to set it up properly is a PITA since I rarely use it, and now you've got cables everywhere, etc. I only use the MixPre when I need 32bit float, more than 2 channels, or multiple backup copies of the audio.