Bit of both, really, Jay.
The website PIREP/award tracking (all backend) works and for the most part the bugs are gone (correct me if I'm wrong Bruno), but personally I'd like to get a little more data back from it.
The spreadsheet gives you direct access to your data, but it's another step you have to do manually. I have been tweeking the spreadsheet recently to get it to do a lot more automatically... not yet ready for "release" but shouldn't be too much longer.
Me, I will continue to work with both for now...