I've also been doing online based genealogy for a number of years (since I got my first computer in 1997), and have used the resources at local FHCs also for their films and fiche. Belonged to the NYG&B for years, until they closed, but only used resources via internet and phone, in addition to their NYG&B Record for my colonial (and not so colonial) ancestry.
My partner's old fraternity brother, and, as it turns out, a distant cousin to both my partner and myself, is the one who told me about Geni. It seemed like a good idea, so I joined. I was amazed at the number of people who are connected to us, and most through just a few families. It's all been interesting to me as a history buff, and that much more interesting when I can become part of that history.
I maintain my own "real" tree on my computer (with about a thousand back-ups lol), then have the merged info in another file. I never thought about connecting back to medieval royalty, but it seems we do, and that's fun - it certainly explains my obsession with the Plantagenets since childhood!
There are many collaborating with me now, and I like that aspect very much. If only I had a faster computer to open profiles and complete merges in the short amount of time I have to spend here each week. But some get done, and that's what counts, and meeting all the wonderful people here has been grand.
@ John, I certainly hope Geni doesn't do away with the forum! I spend a lot of time reading the posts and advice.
As for Ancestry.com, I used their resources several times, but had an unpleasant experience with them so won't be a paying member again. Ditto for Family Tree and their software. I am taking advantage of Ancestry's 'free' offer of 2 weeks to search for the grandfather of an old friend in the 20th C. census records. Here in NY State, we can access Heritage Quest records through the public library (any one with a card), but their 1930 census index is not yet complete. The worst part is trying to second guess others' interpretations of the names I'm searching - some of the transcriptions are outrageously incorrect.
I hope to be using, and collaborating on, Geni much more in the future (say, after a new computer - at least where speed is concerned). The only glitch I've encountered recently is in downloading gedcoms as backups - I'm not even getting all the information I myself put up here. Maybe it's because of all the cleanups going on at the moment.
I, too, like the goal of the shared tree. My only advice to some would be to keep a backup of your own information on your own computer, and back it up! And then back it up again!