Love the JVC TH-BA1.
It's an add-on to my Panasonic 32 S1 LCD in front of my treadmill. The tv pic is fantastic, the sound is a little weak, especially with the noise of the treadmill. Zero "thump" and no way to pump up the dialogue.
This is the first/only bar I've used, though I've heard a friends Sony 100 bar. For my needs, it seems perfect.
Overall impact: A. As everyone says, huge increase in impact from the tv speakers.
Dialogue: A. Center channel volume adjustable on the remote. AWESOME feature, one button adjustment to have the dialogue level just right. Even my wife can do it.
Wireless Sub: B-. Wireless works great. Set up is easy. Remote also has volume adjustment for the sub. It does it's job - this is, as expected, one of the biggest differences between tv speakers and an add-on bar/sub. Couldn't live without it. But there is such a huge difference between this sub and a really good home theater sub... I believe I'm simply spoiled by my living room home theater setup (I've got a Martin Logan Grotto - $1k sub), so it's not a fair comparison, as the JVC is $250-$300 for both sub and bar. But it is what it is - to me, I'd pay more to have a more robust sub.
Remote: A+. Simply perfect. Control the overall volume, and/or the center, surrounds, sub individually. Goes to the bar, where the indicators are, which is much better (to me) that systems like the Sony that have that info on the sub.
Overall, I'd say that for a true home theater, nothing replaces a real 5.1 or 7.1 setup. If looking for a bar for one's home theater, the sub simply isn't good enough. If budget allows, I'd strongly recommend looking for a bar/sub combo with a more powerful sub.
But for a secondary room, or on a $300 budget, the JVC TH-BA1 is great.