I use Versas for AWC. As others have mentioned, they are silent when running at a normal dosing speed, and it's nice to be able to see at a glance if they're working. My LM3 did me wrong back in the day when I couldn't tell that one of the pumps had failed. Lack of documentation on the Versas is frustrating. I haven't had any mechanical issues yet, but they're new to me. Don't use the built in AWC template, calculate your rate for continuous use or use a 23h45m schedule, else you may find your pump stopping at midnight.
My biggest gripe with them now is the stability of the app and the requirement to log in every time. Since EcoTech forces you to connect to their incredibly unreliable servers to view your pumps' configuration or status, you're beholden to them keeping them online, and they're sometimes offline for hours. I haven't been able to check my pumps' status all day due to this.