Let me start by saying that I hated ConceptDraw products when I tried them many years ago.
More recently I tried ConceptDraw MindMap, after being disappointed by NovaMind's pricing and XMind's direction. I also tried ConceptDraw Office. ConceptDraw PROJECT was the only program that I found a bit disappointing, but it was evident that the quality of their software had vastly improved since the last time I had tried it.
Just like they did with MindMap, ConceptDraw offered a previous version of ConceptDraw Pro for free.
I have not used it that much yet, but given the previous reviews it is important to clarify some issues and give potential users a different perspective.
I'm using version 7.6 and there's an auto save option under preferences.
So far, I have not experienced a single crash.
Macworld UK gave the program 5 stars and it's an Editors' Choice.
MacCompanion have it 4.5 stars.
Yesterday I created a document using OmniGraffle Pro 4. I've used OmniGraffle probably since it came out, and always upgraded, but the upgrade to version 5 seemed too expensive for what it offered.
Today I decided to try ConceptDraw Pro for this particular document, and I'm very happy with the results. Some things were not as intuitive as with OmniGraffle, but I don't mind spending some time reading the Manual or the Help. Formatting the final document was faster in ConceptDraw Pro, and the end result was much nicer. For me it was hard to believe. ConceptDraw's software has definitely improved in the past few years.
ConceptDraw Pro includes a wide variety of very useful Templates, including science, engineering, landscaping, management, and many others. I plan to eventually upgrade to ConceptDraw Office which includes newer versions of the applications I have, but I'll wait until the next release since I was not thrilled with their Project Management application. Merlin 2 or FastTrack Schedule are still the ones I would choose for that purpose.
For people interested in this type of software, I recommend that you try their demo and then decide. So far it has worked great for me.