I've got a few of these going. Canadian distributor is NSI.
So far they are pretty good. I use Shaw Sip trunks with them. If the folks don't need the softphone, the mini is a decent option with 25 standard extensions included and the support fee is tiny for the level of support they actually provide. To be honest, it's the support that will keep me using them. They are expensive compared to Grandstream or Yeastar but still less than a mitel. The bigger 250 gets really pricey with the licensing, Especially if you want SIP device compatibility. I have yet to do an install with existing nortel handsets, but have a few customers where re-wiring for VOIP would be a major cost and hassle so likely will before long.

-B