I can't sing to save my life. Actually, I put people's lives in danger when I sing. But that's why private karaoke rooms are fabulous. Because when I sing only in front of friends at least they'll love me despite my inability to carry a tune.
The rooms here are a tad pricy but are well furnished and quite large. We had the medium room which was $40/hour. Drinks were okay priced and you can bring any food you'd like in with you (and there's a Swiss Chalet downstairs if you sing better while eating rotisserie chicken).
The song catalog was tremendous. Not only did they have the karaoke standards, but they also had lots of really new songs. Want some Mylie Cyrus? Some Taylor Swift? Want to belt out Ke$ha? You can at Bar Plus! Ironically, of course. They also had some semi-awkward show tunes, songs made recently popular thanks to Glee, and random Disney ones. And I know this because my group's karaoke repertoire was quite random. The music videos ranged from poorly copied original videos (we got to watch the real "Spice Up Your Life") to some really awkward low-cost shots (Rent's "Seasons of Love" featured 5 minutes of a hobo walking around a city looking sad).
One thing I noticed was that they don't keep track of time for you, so if you really want to have a certain number of hours, then make sure to time yourself. Another group was having trouble because they overstayed their hour or two that they planned to be there for.
Overall, great place. Nice upgrade from XO karaoke and the song list is phenomenal (and gets updated monthly!)