With PEG you are getting very high work quality and professionalism through ever phase of the renovation. Also, because they have a dedicated office staff and a general contractor who oversees your reno (and acts as a primary contact) it alleviates a lot of the stress worrying about all of the scheduling and coordination of the other tradespeople who are usually involved with such a large reno (plumbers, electricians etc)
The PEG installers do the installation of the actual kitchen cabinets as well as tear down and dry wall repair etc, but the flooring, electrical, plumbing and all the "extras" are done through other companies that represent PEG. In each case, dealing with these other tradespeople was a very positive experience. They were professional, courteous, and did a great job.
As far as price is concerned, the actual cost for the installation of the kitchen cabinets is pretty much unbeatable, the value is tremendous. The additional work (tear down,electrical, plumbing, floors) is more expensive however. That being said, part of what you are paying for is the convenience of not having to play the role as your own general contractor. By going through their services, there was minimal need on our behalf to be involved at a deep level with the reno, most days we didn't even need to be home at all, just leave a key in a lock box (that they provide) and be reachable by your cell phone just in case there are questions etc. The days we did need to be home, it was usually just for like 15 minutes when a new team was arriving, and then we would go to work for the day.
So all in all it was a great experience and while I'm sure you could save some money by hiring your own contractors to do the "extras", the convenience of having it all done by one entity not only makes is much easier and less stressful on the home owner, but I think it also greatly reduces any chance of miscommunication or screw ups. I would highly recommend PEG to anyone wanted an Ikea kitchen installed.