Opinions on jiu jitsu practice dummies, specifically Submission Master?

I'm looking to get a grappling dummy to use at home to practice submissions on, and am curious if anyone has tried the Submission Master, as it is the one that looks best for me. If someone could give a opinion on it or recommend an alternative dummy I would greatly appreciate it. Also I am aware training live is best but I'm looking for a dummy to use in addition to my normal training, and on days when I work during practice.