I can normally get the Voda USB modem to run two or three times faster than my O2 dongle, especially in the Dublin metropolitan area. Today, along the banks of the River Liffey in County Kildare, the O2 dongle is kicking its Voda brother in the speedtest stakes.
I can't imagine life as a mobile warrior without a mobile tethering service. I use both the dongle and the USB modem to successfully run Online Meeting Rooms video sessions and Google Hangouts. Last week, I used the O2 dongle as a wifi hotspot service for third level students in LIT-Clonmel when a piece of network hardware failed. The Huawei E585 permits the connectivity of five devices simultaneously and that was fine for several project teams working on campus.