Looks pretty low cost on the surface. Add the extra bits you need and the work to integrate it might make it less attractive. I have three v1 HEMs. I tried a Sense for a while and when I had both of them on the mains the $45 Aeotec v1 HEM reporting locally and easily integrated into HE, was only a few watts different from what the $250 Sense was reading and reporting to the cloud only, with no integration available other than IFTTT (unless I wanted to add other systems and sync the data back from their Cloud API).
How are you using it? One of mine tracks the mains, but the other two track three different appliances for running/completed states (one clamp is unused at the moment).
[Edit] I suppose $109 USD isn't bad and $6 USD for the case. For individual circuits, Dan's solution has always looked very good to me, and if you're in the US the price is much more attractive than getting that here in Canada.