I don't really think so, but I'm still working on it. I started a big long-term project two months ago and I need stability so I've just switched over to Studio One 3 (I can mourn Cakewalk AND be productive). The 1/2 price offer from PreSonus made it a no-brainer. I went with the full-pro version for $250. I'm discovering it may be a a bargain at twice the price.
That said, I've been madly porting over my long-term project files (which are all audio). This pretty straightforward. Export your project to an OMF, save the OMF in its own folder and select the "Reference Audio Externally" (so it saves wave files and the OMF index, rather than everything contained within the OMF, which doesn't seem to work as well). Importing the OMF is still awkward since there aren't my presents, plugins or volume curves, but it works ok. It actually works better going from S1 to SONAR (tried it for the heck of it).
MIDI projects are another story. It's clear there's no easy way (at all) to port a SPlat .cwp file to a PreSonus .song file. Nothing does that and I doubt anyone will code anything that will - there are so many variables that I doubt it's worth the effort.
The reality is this: Cakewalk is at end of life, and my job isn't. So having made the switch I'm going to live a dual life. The learning curve is shallow and short for Sonarians - besides, all the concepts are the same. Mostly it's learning new nomenclature and where the buttons and menu items are.
SONAR is now my archive/retrieval system. If there's anything there I REALLY need, I'll kludge together a hacked MIDI 1 file and suffer through a rebuild to have a native project in S1.
So ultimately, unless some kind angel writes a script or app to port cwp over to song files, we're kind of stuck. I'm not happy about it, but I can live with it. And again, OMF is a half-reasonable solution but really you end up with audio files and a reassembly job in S1 because SONAR's OMF export isn't very good (OMF has its limits and is out of development too).
That's my experience/direction so far.