Welcome to The Gauge, and welcome back to the hobby...!
I have not tried the TrueTrack itself, but did have a sectional track layout. In the end I was not overly satisfied with it, since the SnapSwitches and the sectional track has limiting geometry that means I did not achieve the look I wanted. Since I switched to Walthers/Shinohara numbered turnouts and flex track, I like the look much better.
There are definite advantages to the sectional roadbed type track. It can be set up and torn down as many times as it takes to get a plan you like. It is great for temporary layouts, like Christmastime. The Atlas TrueTrack allows you to remove the Code 83 or Code 100 track as well, so in the future you can put down (in some opinions) better looking roadbed and ballast.
Drawbacks include limiting/limited configurations, wider radius curves and certain turnouts may not be available. Some people do not like the look of the plastic roadbed.
Remember in model railroading, there are lots of right answers to any given question. The key is to find the right answer for you...
Andrew