Summary: T642 is an good work horse and is less expensive than the T644. The unit has a high monthly duty cycle and I would recommend this unit if you already use T642 or T644. Otherwise I might advise you to consider another vendor, Happy Printing (HP).
Summary: Comments about Lexmark T642tn: This printer is good for the office or home office. I use it at the office for printing lengthy documents such as legal agreements. It is high quality, but it is a little noisy. I would recommend this to other businesses if they do not mind the noise.
Pros: Accurate Colors, Efficient, Fast, Sharp Detail