Summary: At work we have had the 3051 ND for over a years and they are very fast, even when printing double sided. Operation is a little noisy, but not too bad. The cartridges are all-in-one (drum included), and are very affordable (if you do a lot of printing remember to get the high capacity 3050B cartridges). Quality is very good and compatibility is high (use on Macs OS 9-X, and Linux) I recently bought one here for home and again it is doing very well.
Summary: If you need duplexing at all, then order the ML-3051ND which seems identical to the ML-3051N except it includes automatic duplexing [printing of both sides of a sheet] and may cost $20 more. The ND version does a fine job with duplex print. I use the Multipurpose Tray a lot, with envelopes and half-letter [30lb. & 20lb 5.5" x 8.5"], and never have had a jamb.
Summary: I love the auto duplexer on this printer. It works fine, produces decent quality prints, and does the job. My complaints are that the registration is a little off on double-sided prints (it varies between 1/16" and 1/4") and it is somewhat loud while printing. I have used the printer with a variety of paper stocks and have been really pleased. Every now and then the manual feed has a tough time picking up cardstock. But the occasional paper jam is easy to clear up.
Excerpt: The technology has been its character and simplifying technology has been its motto. Samsung has come up with a monochrome laser workgroup printer, a boon for small work group. Calling it as Samsung ML 3051ND Laser Printer, this printer weighs 11.1kg with dimensions of 40 x 43.3 x 28.5cm.
Excerpt: me parece un producto exepcional, yo la tengo en mi casa y es muy facil de usar ademas es rapidisima , imprime muy bien, buena calidad y la tinta del tonner me duro un año y un poco mas , es muy practica para la colocacion de las hojas, se colocan en la bandeja de abajo que se tira hacia adelante , es asi muy muy muy facil de usar , la recomiendo sin dudarlo el incomveniente que le encontre es que de vez en cuando hace ruido sola, se enciende sola y arranca como si fuese...