i’ve got a small site using 15 9133i and 10 480i units. now that the BLF issues have been fixed with firmware 1.3.1, the only issue i’ve had to gradually “tweak” out is one of handset TX gain on the 480i. at +6/+7 i think we’re eventually there ! we’ve had a couple of comments about sounding muffled though. i’ve used one a lot recently and thought the sound quality was good.
robustness-wise, it’s a bit early to say, but they seem well made and i’ve bounced one or two off the desk without problems. multi-position mounts and angle-able displays help with user ergonomics a lot.
for a reception user, a Snom 360 and sidecar is the way to go though !!
oops … just remembered, the firmware update seems to freak out the same phones with regularity and they need “fixing” with the web recovery mode. so once you’ve got the firmware up to date, remove the .st file from your TFTP root directory … makes a restart much faster too.