GParted makes no sense from an economical perspective because the tool I looked at tonight (Paragon Partition Manager Professional 8.5) costs 80 EUR which is less than our rate for an hour. In other words: If the "free" solution costs me 30-45 minutes anywhere (during a conversion operation, trying to work around booting problems, bugs in the software etc.) I am losing time, hair and ultimately money.
Without having tried it, some aspects jumped right into the eye:
I've ever only had one problem with driver support on Windows (ICH5R, because Intel suddenly dropped support for this chip in this mode from one driver revision to the next), but many more cases of Linux not recognizing RAID controllers, unstable behavior and so forth. And I am very picky with Linux rescue/live CD systems and not shy to roll my own with a custom kernel to boot (excuse the pun).
Functionality wise you can read they depend on things like ntfstools and that is where I stopped reading because this is no full blown NTFS support. Look at the screenshots and you will see they mess with the file system, mark it 'dirty' when they are done and then let Windows' chkdsk sort out the leftovers that need fixing. Granted chkdsk will fix all problems but this leaves bad taste in my mouth. With NTFS there is so much that can be done the wrong way, which is of course by design and willfully done on MS' part. Do encrypted and compressed files still work after GParted has resized a partition? I don't want to find out other than by reading other people's posts.
Jack of many trades, master of none.