We have a Trek DoodleBug (predecessor to the current GoBug), and it's worked out well.

Only one kid, but it has space for two. We picked the Trek over the Burley because of:
- more legroom
- very good deal on a floor model ('05 trailer purchased in '06)

We haven't really had any significant problems with it. Total mileage is probably in the 1500-2000 range so far (we only bought it this past summer).

The non-significant problems:
- It took a month to get a second hitch in (LBS had to order it from Trek, Trek had it backordered for a while)
- One of the wheels had a burr in the rim that caused it to flat (where the rim is pinned). Easy enough to fix in 30 seconds with some emery cloth, but cost us a couple of tubes before we found it.

It also has a trunk that can hold 4-5 bags of groceries (some vertical stacking) without too much trouble (lots of runs with 1 kid to the grocery store, 1 kid + a bunch of groceries from the grocery store)