So, we purchased this Thomas O'Brien bookcase on both a hunch that it would work well for us and on AT readers' mostly glowing recommendations. What we didn't read until after the purchase, however, were comments about the wobble factor. Deciding to brave it anyway, we put the bookcase together (in about 10 minutes - super easy) and forged ahead...
It is a bit wobbly when bumped into (thankfully I don't go stumbling around my office too often), but otherwise the unsteady factor isn't really a factor. I'm certain it's not going anywhere. I opted to not anchor it to the wall so that I'll have flexibility for moving it to another part of my office or to another room. I prefer to have open ends and to use bookends, so am still happy I chose a less bulky shelving system than an enclosed one.
This is only a fraction of our books that need a home, so if I had the space I'd consider getting a second one and standing it next to its twin for one full wall of shelves. For now, though, I'm satisfied with this piece. And for the price ($179), the good quality (those shelves are tough) and good looks confirm our decision.
Thanks, everyone, for your feedback and opinions!