I wouldn't recommend the bus for people who don't know anything about the city, because I have yet to hear something positive about it from travelers who just take it on their own. Taking it with someone who knows the city might not be a bad idea, but that's not what these people reported having done.
Suggested Tours:
1) BA Local www.balocal.com
They also have shopping tours, art tours, off-the-beaten path tours, and Jewish tours. With a private driver, via taxis, or walking. The tour guides are expats and their main city guide is pretty entertaining as well.
2) Anti-Tour www.antitour.com.ar
The owner/main guide is a local who not only grew up in Buenos Aires, but also works restoring old buildings including Teatro Colon and Basilica de la Merced (on Reconquista).
3) Buenos Tours www.buenostours.com
These are 3 hour
walking tours. The owner/ one of the guides has spent years writing up various aspects/tips/reviews of the city for their website. The tour guides are expats.
I wouldn't recommend the bus for people going alone, but it might be fine with an expat/local who can tell them where the building is that the recording is talking about, that is
if it wasn't about a block or two back when the recording starts up again.
At least that's what I've heard from travelers who took private tours a day or two after taking the bus tour.