I've heard nothing about them personally, but they do have an alarming number of adverts looking for teachers.

This is most often a sign that there is something going on at a training center, especially if a center is constantly looking for teachers, and not just on a 6 month or yearly basis.

They appear to have trouble keeping teachers.

http://www.chinaesljob.com/jobs-at/dww-english/

http://www.esl-job-china.com/job_chengshi.asp?proid=6

http://www.abroadesl.com/index.php/tag/dww-english/

From this site:

School -- Guangzhou -- DWW English -- 3 July 2013
ESL Training Center in downtown Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Teach small groups of adults! One to one adults and kids! Plane tickets, Work Visa, .

School -- Guangzhou -- DWW English -- 2 July 2013
ESL Training Center in downtown Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Teach small groups of adults! One to one adults and kids! Plane tickets, Work Visa, ...

School -- Guangzhou -- DWW English -- 30 June 2013
ESL Training Center in Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Small groups of adults! One to one adults and kids! Plane tickets, Work Visa, Insurance, and Paid ..

School -- Guangzhou -- DWW English -- 29 June 2013
ESL Training Center in Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Small groups of adults! One to one adults and kids! Plane tickets, Work Visa, Insurance, and Paid ...

School -- Guangzhou -- DWW English -- 28 June 2013
ESL Training Center in Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Small groups of adults! One to one adults and kids! Plane tickets, Work Visa, Insurance, and Paid ...

School -- Guangzhou: 11000 RMB/Month! 24 hours/week (No Office Hours)! ESL Training Center! -- DWW English -- 26 June 2013
ESL Training Center in Guangzhou, China! 11000 RMB/month+Benefits!! 24 hours/week (No Office Hours)! Small groups of adults! One to one adults and kids! Plane ti

The pay is well below average for Guangzhou.

Perhaps someone who's worked at DWW English Guangzhou can shed some light on the situation there.