As the posts above has said, it isn’t the best due to auto saves. I’ve found they can get in the way a bit, which is a real shame as I really like it otherwise.
Autosaves are annoying but they saved my bacon once.
Studio One has a really weird bug where once in a blue moon when you open a project, it will actually open your project TWICE and keep one hidden. I learned this the hard way, with clients in the room. (It took forever to sort this bug out).
So I opened a project which had been roughly sketched out in midi the day before. Spent almost 12 hours with musicians tracking everything for real. I saved and then closed Studio One. All of a sudden a dialog box opened that said, "Do you wish to save?" and I clicked "yes" like an idiot. All of a sudden you could actually see all the tracks and the work done all day disappear and then the file re-save! One of the musicians even said out loud, "What the f**k?!" My stomach hit the floor. I re-loaded the song and EVERYTHING was gone! All the work we had done all day. I was freaking out, the clients were freaking out. I just kept stuttering!
Thank God for "Versions". I had checked versions and was able to re-load a previous auto save and got everything back except for a single track of guitar, which we quickly re-tracked while it was fresh in the guitarist's mind.
It took me a while to hunt down the bug, which like I said, I eventually figured out that once in a while it will open two copies of the same project and hide one. So you work on one, then when you close Studio One, if it asks if you want to save again, it's actually referring to the hidden, untouched project. When I clicked "yes" it basically re-saved the untouched project as the most recent one!
The only workaround I've figured out to get around this bug is that I've gotten into the habit in Studio One now of when I'm actually done with everything, I do one final save and that way when I close Studio One right after, if it asks if I want to save I just click NO because I know I already saved it.
So that's something else I miss in Sonar...Sonar actually had a setting in the menu that says "Only allow one project at a time to be open" and you can choose if the program can't open more than one project.