Hi!
This question has been asked so many times, yet it is one of the most difficult to answer - especially without knowing what you need the cordless drill/driver for.
Back in late 2015 I bought my CXS and it has seen plenty of use since then. I even bought the Centrotec Installer Set (German, European version) to go with it - not knowing if I would ever buy a larger Festool cordless drill/driver. The CXS is one of those tools that is worth it's weight in gold. It is lightweight, compact and offers plenty of power/torque for a 10.8/12V cordless tool. Holding it between thumb and index finger, and pressing the power button with "THE finger" - will reveal how comfortable, like an extension of your hand/arm, this tool can be handled during operation. Serial drilling with the 5mm self centering drill bit or the 5mm tungsten carbide drill bit with depth stop? Amazing! No fatigue, very fast and excellent results. 6mm hole in tile with a high quality multi-construction/multi-material drill bit? Done. 8mm and 10mm drilling through 70x70 mm wooden posts - absolutely no problem.
Add the small drill bits for wood and combine them with the angle attachment - there will be very few occasions, if any at all, were you won't be able to drill. The footprint of this drill/driver (even with added angle attachment) is so small, you can get almost everywhere with it.
There's one thing though that I consider the only drawback this tool has: the battery. Currently it's like the only standalone player in the Festool tool range. The CXS/TXS batteries can only be used in the drill/driver - that's it. We might get surprised one day with another 10.8/12V tool - but until then - it is like it is.
Having then purchased a DWC, BR 10 and the TSC the 18V world of Festool opened up to me and 2 days ago I got a PDC.
So far I made a couple of 6mm holes in masonry utilizing a high-quality multi-construction/multi-material drill bit and percussion mode - this thing eats bricks! It's great - since I've been using rotary hammers all the time I know what progress is - and it's incomparable to old percussion drills and my experiences with them. So what I originally thought was just nice to have, will now be utilized more regularly. Then I needed to pre drill 3mm in a wooden board and 5 mm into a plastic housing - the PDC can handle delicate tasks, no problem. Fastening 4.5x80 screws in old, dry *whatever*-kind-of-wood - the PDC didn't even take notice of it as expected.
Now the discussion about lack of power - I can't fathom it. I think Peter Parfitt demonstrated whats possible very nicely in his review of the PDC 18/4 ->=9m25s
If one needs more power than that - it might rather be a job for an impact driver - as they tend to put a lot less stress on the bolts. But I don't know about code/regulations for wood constructions in the US/UK.
What I'm not 100% happy with right now is changing gears on the PDC. When it arrived it was smooth as silk - simply perfect. Now, after two days of light, maybe moderate use and absolutely no dirt that got into the switch - it's kinda sticky and needs a little more convincing to work. It even shut down and beeped, two times after switching in the 4th gear and pressing the trigger - zero load on the drill. BUT, having 3 years of warranty eases my mind - I will keep an eye on it for some time and use it - if this happens more often or the gear switch gets really stuck, it's going to be sent to Festool.
If you go for a drill/driver like the PDC or DRC buy one of the compact batteries, too. These get really heavy when used with an outstretched arm and having a 5.2 Ah battery installed.
I think the DRC/PDC are the perfect all-around medium to heavy duty drills/drivers and make an excellent set with an additional BHC.
Kind regards,
Oliver