Features are pretty much the same as well. The unit still lacks the 50C rating as well as over temperature protection. As this unit has modular cables, Antec does manage to add another green check on the list and it will likely help the series appeal to a wider range of users.
Antec has an MSRP of $99 on the HCG-620M unit. We were able to find it cheapest at Provantage at the time of writing this article for $97.64 after shipping. Antec backs the Antec HCG-620M with a three year warranty.