Not all Polk fans like every speaker in their line-up. I did not care for the RTi line but lived with the older RT5000 set for a bit. I think the LSiM is a really nice speaker line for Polk. Between the 703, 705, 707 Polk offers slight variations to the sound signature. Polk put a lot of their engineering into this line. The 706 center and 707 towers measured ±1.37 dB and ±1.49 dB from 500 Hz to 20 for example. However, the 705 and 707 do get up their in price. There are so many other nice speakers in this price range....I'm sure some are swayed by other brands. Anyway, the new Signature line is supposed to pull from their past and present engineering but offer not as hot of a top end as the RTi line. Given the price, they are worth a listen for those shopping in that $500-$1300 price range. I think many Best Buy locations offer them now and think they sound nice for the price. Plus the Walnut finish looks very nice.