I have both the larger (premium) bellicon different band tensions are fantastic (I have used Strong and Extra Strong, but prefer the Strong for the softer bounce). They have wonderful customer service if you have a question or just aren't sure which one to buy (or what band tension). I bought a smaller one in case I want to take it somewhere (but it is still kind of heavy, FYI).
They are very well made and sturdy. I would recommend getting the 44 or 49 inch unless you want to take it somewhere. The 39" is great but doesn't give you as much room for jumping jacks etc. The website videos are also great (although I wish they would give them to us for free if we buy a bellicon) as there is currently a cost for those.