82,
I have an EasyTouch and ScreenLogic and have found zero reasons for me to upgrade to the IntelliCenter.. That said, if I were building a new pool today, it would only make sense to install the new IntelliCenter..
The key is what are you actually getting today??? You can't just have "ScreenLogic".. It has to be connected to an EasyTouch or IntelliTouch. What you want to make sure you are NOT getting is one of the lite versions of the EasyTouch.. It is a cheap imitation of the real EasyTouch. It has no load center for your circuit breakers and a set of much reduced functions. If the model number has an "L" in it, like PL4 or PSL4, it is a lite version, and just like lite salad dressings just does not taste like the real thing.
So, go with the IntelliCenter if you can and the cost is not too much more.. If you can't switch, I would not worry too much about it as the EasyTouch will do everything that most pool owners will want to do.
Thanks,
Jim R.