The only negative at this point is that it needs a switch flipped to select HDMI or VGA. Auto sensing input type would be great. It already handles auto sensing input resolution just fine.
We ended up getting one in January to test, and we now have 20... that tells you how happy we are with these bad boys, especially for the price!
However, I would add a few other pointers. If you're doing a conversion where the resolutions are pretty much the same (1280x720 from PC to 720p SDI/HDMI) the conversion is quite good. However, when converting the resolutions up or down, things tend to get a little blocky. The actual scaling on them is a little rougher than a higher end piece of gear (which for the cost, is not a surprise). But for the most part, if we need to send out 720, we feed it 720 anyways, so no loss there.
Also, when running it in PC control mode, you get size and position adjustments, but the range is somewhat limited. If your VGA image is way off or if you want to zoom in on a certain part of the screen, you may be out of luck.
Lastly, if you're using it to convert SDI back to HDMI at a monitor, not all monitors will accept the signal. There seems to be a lack of (or improper) EDID information from the DAC70. In our case, we just use DAC70s for "sending" signals down SDI and then we use AJA HI5s for the conversion back to HDMI.