Installed many of these devices over the years.
The 5624 are fantastic because it does not need additional infrastructure, however I have seen roaming issues with Cisco Mearki and any Access Points that are not controlled by a central controller, the handsets tend to hold onto an AP right until it has an extremely weak signal and then drop the connection for a second or two while it re-homes. Not necessarily dropping the call but you will notice choppy audio. Best results have been with Aruba and Rukus WiFi setups. One major downfall and I see this a lot is the programmer you need to configure and charge these phones, they tend to go missing and are quite expensive to replace.
The 112 is easy enough to deploy in SOHO setups and because it uses DECT 6.0 the signal is pretty much uninterruptible and has a great range (up to 40 - 50 feet). You can hang up to 20 DECT handsets of one 112 RFP, up to 3 repeaters and handle 5 simultaneous calls. There is a web interface so remote management is easy. The only downside is for large deployments these take some time to set up, but if you use DHCP option 66 and set up a config template you can auto deploy these devices and make mass changes fairly easily.
