$159??? That is incredible.
Yep. There have been some ridiculous sales on these and other speakers in the same line. Last sale from Harman direct (US) in early/mid March had some very nice prices on nearly the whole lineup:
Infinity Reference RS152 Surround Speakers (Pair) - $134.95
Infinity Reference R152 Bookshelf Speakers (Pair) - $134.99
Infinity Reference RC252 Center Speaker (2-way) - $134.95
Infinity Reference RC263 Center Channel (3-way) - $159.95
Infinity Reference R162 2-Way Bookshelf Speakers (Pair) - $159.95
Infinity Reference R253 3-Way Tower - $169.95 (these sold out pretty quickly IIRC)
Shipping was free, too.
I bought a pair of the RS152's, but I'm pinching myself for not just replacing the rest of the speakers in the setup, very tempted to order a RC263, a pair of the R152's, and a pair of either the R253's or R162's the next time they go on sale.
As for the RS152's, I had been looking for some rear surrounds with extra wide dispersion to use wall-mounted in a 7.1 HT arrangement (as I only have about 3ft from the main listening position to the wall). They are very solidly built and dispersion seems quite good judging from what I've heard so far, although the timber differences vs the rest of the speakers in my setup are rather obvious to my ears (I'm a bit new to surround sound, but still probably should have known better than to mix speakers from different brands for the surrounds).