I had an Amby and loved it. I used to leave the stand in the bedroom and hang the hammock from a 'jolly jumper' doorway spring in the lounge room or I would take the hammock and the door frame spring when we were going away.
I have also had alot to do with the happy hangup. I like the look of these much better, the timer frame etc. And the people who make them had their children in them (almost 2yo) sleeping at the markets, I found that my babies didn't last that long in the Amby.

THere are other hammocks around. At the end of the day you will be happy with whichever one you buy. The all have pro's and cons!