I haven't had the PC, so I can't comment on it, but I do know PC makes some good tools as I have some PC power tools and really enjoy using them. However, I did buy one of the better Dewalt ROS 5" sanders and I had a hard time using it. Very noisy, lots of vibration, and all the sander wants to do is jump around on the work piece if not being held perfectly. Due to the grip arrangement, it is very fatiguing. The Festool sander by itself was more, but there is no comparison to the Dewalt. Far less vibration, probaly half the noise level or less, and much more forgiving on how it is held. I actually look forward to using it when coupled to the vac. I have some Dewalt tools that I really like, so not trying to be negative about Dewalt, just that particular sander.
The Festool vac works great, but not sure I would get one just for clean-up around the shop or use with a chop saw. I think it will not be adequate for chop saw dust collection, not enough CFM, and the hood design on most chop saws are lacking. The Festool vac would make a pricy shop-vac IMO, there are other features on the Festool vacs that warrent a higher sales price, so really can't compare the two. I do think you may find additional uses once you have one, but you will have to decide the value of that.
Whether or not the Festool prices are fair, it depends on the market and their business model. If the items are selling and their business model is going according to plan, then I would say they have the right combination of quality, price, and service for their intended market. I used to think it was too high priced and out of reach, but it sure beats any of the other sanders and vacs that I have owned.