I know this is a older thread but I thought I might post my thoughts here rather than open a new thread.
With the help of several individuals here in particular Russ, I was able to natively export my Sooloos content to a USB drive and use that as the source for another go at Roon. Many of the issues I encountered with my first foray into Roon have been addressed and I get more comfortable by the day.
I do have two issues. First, I dislike how Roon handles play queues. When I play a album(s) I do not want the play queue to disappear. On occasion I want to be able to delete the tracks I no longer want to hear and either create a new queue or append what is left to one of my favorites. This currently drives me crazy.
Second, and this one might be in my head. I "believe" that my content sounds better when played via Sooloos than Roon using the same endpoint. I know, it sounds crazy.