I have about 1-2 bars in my house, which for some reason makes my phone not consistently connected to WiFi calling. I have 4 access points throughout my home, and unfortunately, none of them support 802.11k/802.11r. That means I can't walk around the house without having a lag period when my phone switches from one WAP to another.
The MicroCell gives me 5 bars around my house (with exception to the basement). It does take a while to configure properly, but if you place it in your router's DMZ, it makes it a lot easier.
In my opinion, the MicroCell works better than WiFi calling.