...I've had the 1600's for about 6 months, and have done plenty of shoots, using them as portable lights, using their Vagabond battery pack for $499. Works great, and have had them blow over many times when using their big soft box, and they take a lickin and keep on ticking. The color tempertaure issue would have been important a few years ago, but most shooters are doing heavy post-production using photoshop, and a 300 degree color temp difference or swing can very easily be corrected. I personally haven't noticed it, so it boils down, for me anyway, whether I want to spend a lot more for a slightly better battery pack option, or continue to use these, which have worked great thus far.
BTW, I do advocate better lights in a studio, where color temp is more important. I use Black Line Speedotron 1200 & 800 units. They are built tough, and are a great in-between light, that have been proven over the years. Oh yeah, their American made, unlike most of the lights people rave about.
Below are a few examples of images photographed using a single (1) AB 1600 unit, with a 20x30 soft box and the Vagabond battery pack.
My 2 cents, hope it helps!!!