I got one of these. I like the fact that it was around the hobby price mark (80$ on amazon). Sure, its close to 1 watt / ghash, but at that price point its ok. Eventually I'll get an sp20 (once they bring it down to a reasonable price, what with the recent crash of BTC/USD).

My only complaint about the new R box is the noise. I ended up removing the guts of the R box from the metal frame and making a foam shroud with a nice 120 mm silencio fan. Now the thing hashes away in my living room.