As a straight answer to your question though: yes I'm happy with it in my barebones configuration. It is a solid piece of kit, but some sacrificed have to be made to maintain portability and small size.
Its best and worst part is the large router fence which has a rather rough adjustment by loosening the fense bolts and tap-n-align method of fine tuning. The fence has micro adjustment for the offset of the two halves of the fence, but none for the fence relative to the bit as a whole.
If your shop is stationary and can fit a router table to stay assembled at all times you can probably get a better router tables cheaper elsewhere.
I'm currently looking into possibly getting a MFT-VL extension to my MFT/3 to have an incra fence on the MFT for both sawing and router module usage in the VL sort of like Festoller has built.
Planning on keeping the router permanently setup in the GE base for roundover, etc. uses and the TS55 module primarily in the VL to have the MFT+VL as a 'table saw' and an incra ls precision fence setup for the saw and for the odd box joinery gigs with the router module in the VL as a guest module when needed.
Ofcourse if you purchase the set version with all extension tables included you won't have the financial incentive I have to look at options since I only have the CMS-GE base unit and the sliding table module and no extension tables at all. With them tables costing 250€+ a piece and the better festool fence another 170€ getting the Incra LS basic fence package and a VL extension to my MFT turns out to be only about 150€ more expensive with clear benefits like being able to use two CMS modules concurrently and the fine adjustability of the incra system.
All the above is of course still theoretic mussing since I have more research to do on the incra system before pressing the trigger on the VL & LS order, but its looking like a good option right now.
I don't have the set with the extension tables so cannot comment on how good they are in practise, but depending on what you use a router for you might need quite frequently larger work piece support and/or fence width adjustment capasity than the base unit provides. At least they feel solid when I've looked at them at my local Festool showroom.
What I'm not totally sold on is the continued portability of the system if you have to haul the base unit, two extension tables, the slider module, the micro adjust fence, the angle unit, the Y-hose set and the router fence with you even with the router attached to the base unit. That's an awfull lot of loose kit to carry around that doesn't fit in a systainer.
I think that JMB is better qualified to tell you how the CMS system holds up to real site workloads and schedules since my stuff is a hobby and time efficiency is not a high priority to me. i.e. I have time to fiddle with the fence and take my time in putting the parts together when I feel like building something and generally measure twice, go back to the drawing board another three times, measure a bit more and only then make a cut ;-)