I have used U-Pack twice. Both times they have been great. Fact this last time was short notice and I was in a huge bind. They really came through. I highly suggest using them if you don't mind doing the packing. Very reliable and professional group of people!
The last thing I wanted to do was move my family cross-country inside a Uhaul or caravan with a car and truck. If you've got the do-it-yourself energy and a few buddies to bribe with pizza and beer, U-Pack is the best solution. I look forward to utilizing their services again in the future... hopefully not too soon in the future.