Hello and welcome to construct and the forums!
Construct sure is more powerful, flexible, and effective to use then mmf, but i have to warn you. Crashing and making your files unreadable is kind of constructs thing right now. Ashley is hunting the bugs desperately so they will hopfully be gone within a few new builds, but right now you have to be very careful, and use autobackup and autosave.
It happened two times yesterday that construct started to save unreadable files without crashing. The result was that when it crashed and i tried to open the latest backup, six of my backups was corrupt and i had to start over from quite a while back.
So take it easy. Dont get scared away because of that. It will be fixed.