Man, if I were doing field interviewing, I'd probably use an Oade-Modded PMD660. Way smaller, still has XLR, can even patch a news bay directly (only the modded unit), noise floor is plenty low (again only on modded unit), rechargeable batteries last forever, instant on/off, uses standard CF cards, and 16-bit (which for voice seems plenty adequate to me, and possibly preferrable even). The ONLY reason I could think of using an R44 would be if I needed four mics/lavs for a big interview, otherwise the modded PMD660 kills on ENG use IMHO. The stock R4 is a gigantic heavy brick that takes 30-secs to boot compared to it -- although I'm sure the R44 would be better, I'd still go PMD660 unless I absolutely had to have 4-channels. (BTW, this is coming from someone who owns both an R4 and an Oade PMD660).