I recently spent some time looking at the slackline products that Gibbon makes and wanted to share what I discovered. Being somewhat new to the sport I ended up buying the Classic. I've had it for several months now and am very happy with my choice.
Gibbon makes several different slacklines. Their main product is the Classic. The other options are the Jibline, the Surfline, and the Funline. They are all 2" wide but some vary in the type of webbing material, which makes them more or less bouncy. They do sell 1" webbing, but a lot of people prefer the 2" webbing and I think it's definitely a little easier to balance on.
After checking out their different slacklines and owning one myself, I can recommend choosing the Classic. It's really their main product, the most basic and the best price.
It comes in a 49 ft or 82 ft length. I went with the 49 ft length and have not found that I needed it any longer. If it's shorter, it's a little easier to balance on. You can make either length as short as you want with the ratchet mechanism.
The Classic can be used by beginners and experienced alike. It's very strong and like I said, pretty easy to set up. You can even use it for skateboarding or snowboarding as a portable rail slide. It comes in two colors, red or yellow, with the Gibbon company logo on it.
The Funline is very similar to the Classic. Really, the only differences are the color and the length. It is blue with some bright pictures on it and is 40ft long. Since it is more expensive but shorter it's not really as good of a value, unless you really want blue.
The Jibline is made out of stretchier, bouncier webbing but it is still plenty strong. This webbing makes it more dynamic, like a trampoline, and enables you to do more tricks by jumping on it. It is grey, yellow, and black in coloring and comes in a 49ft length.
If you're new to slacklining, the Jibline can be a little harder to balance on and you will be plenty busy just learning the basics on the Classic. The Classic is bouncy enough to do some jumping on.
The Surfline is much like the Jibline, having more dynamic, bouncy webbing. It is 100 ft long and their longest line. It has a longer handle on the ratchet, to enable you to get enough tension on the line. The longer the line is, the harder it is to get enough tension, but this ratchet is up to the job. Its color is purple.
I can definitely recommend going with the Classic if you're just getting started. It will keep you busy for a long time and you will not be disappointed.
I hope this overview of Gibbon Slacklines was helpful and that you give this sport a try. It's a lot of fun and it's something you can take with you almost anywhere. Let the slacking begin.