We ourselves have several Snom m9 phones installed at customers and have had no complaints.
Only downside, for now, is that Snom still needs to produce the repeater that goes with it. Of course, if the customer only needs to cover 50-100m in either direction this won't be an issue.
We also use Siemens DECT phones and they work fine as well. They're just a pain to transfer a call to another portable phone on the same access point. It works but it needs some training first.
Hope this info helps.