Lets limit this discussion to the AVCHD recording format and the quality of video you'll be getting (technically & subjectively).
AVCHD is quite a highly compressed video format, not very impressive in my point of view.
Depending on your requirements, for that price, I may just consider the new canon 7D camera since it's using H264 compression too...equally as bad in video compression as compared to other video recording formats.
Of course considerations of drawbacks using DSLR for video acquisition are in battery life, continuous recording times (file size limits), and audio input capabilities.
Benefit of using the 7D's movie recording feature lies in the options of using many different lenses.
If you're doing events video filming, perhaps the HMC-152 will be good for your applications, but if you're doing more cinematography style of filming, perhaps the new 7D DSLR may be a better option.