Just got my HE and am switching from Wink. Under Wink, I used a WiFi device called a Spotter to detect when the washer and dryer were done. The Spotter has an accelerometer, so I'd receive a notification 5 mins after vibration ended.
What's a good zwave replacement that works with HE?
If you're thinking about getting Xiaomi, I advise you to read some of the forum posts about them before buying. They might be cheap but you're going to have to use VERY specific repeaters or they won't stay on your network. I won't use them. But a lot of people love them.
You have to put one of the clamps around one of the 120 lines going into your dryer. The other can be uses for the hot 120 to your washer. But you can't but the clamp around the whole wire. I was able to separate the lines going into my dryer quite easily as it was flat and had about 1/4" of insulation between the lines. But just unplug it before you try to separate them. PLEASE!
If you're looking for a DIY solution, I just built one of these using an ESP8266 board and a Split core Current transformer. But if you're not into that kind of stuff you're going to spend more on getting all the needed other "bits" to do it than you would on the HEM. But it is an option if you wanna look at it.
Sense has an IFTTT trigger. You can just have it send you a notification when the washer or dryer turn off. You could use Pushover for the notifications and just add delays before notification for the washer if you have issues with it detecting a pause as off. Although I believe Sense should be able to differentiate between the two.