Ok I have owned a DSV for a while(August 2013). I believe that I am the first one on this forum to have one. I have a review posted here...
http://www.letstalkbbq.com/index.php?topic=5621.0I do not own an Anova although I am impressed with it's design and costs. I really don't think that either unit is a bad choice. I am biased however because I own a DSV. The Anova was not available at the time of my purchase.
Here are some other talking points about the Dorkfood DSV that Tim did not talk about.
You can run any non-digital crock pot, Turkey Roaster, Fryer, of course. But you can also use a submersible heating element also! Those can be purchased online and allow you to use ANY vessel that does not have a heating element. Just drop the element in the water.
As Tim stated there is a natural water movement that is created when the hot water is rising and the cold water is dropping. This makes a circulator not really needed especially when using a crockpot for example. But when making very large items this can disrupt that natural flow so a simple aquarium bubbler with a air pump works just fine to create better water circulation in these situations. Circulation however also creates more evaporation and a vessel without a lid will lose water pretty quickly.
Now one issue with the Anova is it is more complicated than the DSV. The motor, impeller, and o-rings can all fail due to build up of mineral deposits. Anyone who has looked at the inside of a water heater can understand what I am saying. When water is heated and evaporation occurs there is a concentration of these deposits. Very hard tap water is the cause. So if using the Anova I suggest using purified water or reverse osmosis filtered water to eliminate this possible problem. The DSV will not have a problem using tap water because the only thing you place into the water is the temp probe. So one less thing to worry about.
The housing for the DSV is well built and water tight. Plus I would not feel 100% comfortable having a device plugged into house voltage and hanging off the side of a vessel filled with water. Sorry just me. It might be completely sealed but I would still wonder. I can locate the DSV many feet away from the water filled vessel and feel confident that there will not be any issues with electricity and water. It has very long cords for the temp sensor and electric plugs.
A crockpot is very efficient at heating. The ceramic interior evenly distributes the heat through the cooker making temps very efficient. I love being able to use my large crock pot for SV cooking. Something I already had that can serve another purpose. And it has a lid.
The price is only $99.00 and you get the great customer service of Dorkfood. They are also a forum sponsor so we have a direct connection to them.
The only negative I have for the DSV is the relay clicking. But it is not that loud unless the room is completely quiet. And I actually like hearing it so I know that it is on the job regulating my water temperature with precision for a perfect cook