I've been researching the hardware for a while and read that most of the chepaer devices that are available on ebay and amazon are cheap chinese crap. I wanted to buy the recommend $100 model but kepts putting it off because, well, I don't want to spend $100 on a toy. Then I finally figured the other day, let me just take my chances on a cheaper model that has good reviews so I bought
this one for $24. It works out of the box (well, out of that baggie that it shipped in; and who knows for how long)
I tested earlier this evening with the free version of the phone app but once I saw it works, I sprung the $4.99 for the pro version. All told, $29