Telescoping 3ph arms make it much easier to attach implements.
In general you loosen the stabilisers every time you take things off (to get enough play to get the arms off the pins), and then tighten them so your implement doesn't slop around.
The turnbuckle style tend to get dirt and grit very quickly, and sometimes get bent a bit. They then become very hard to turn, so you need a crescent spanner or a set of pliers, and you fight them every time. You also screw them all the way out, then all the way in, which is time consuming. It works, but it's annoying. Telescoping arms you just pull a pin out and they're lose, you put them on, drop the pin in the right hole, you're done. They're massively easier.
You can also get telescoping ends. That means you can back up close to your implement, then pull the arms in and out a bit to fit onto the implement. Without those you have to horse the implement around to get it exactly lined up, and the bigger your tractor the bigger your implements. With my B2601 the implements are small enough to push around, and I store them on dollies in the shed so they're easy to move. With anything bigger you tend to store outside and they're too heavy to easily move. Then a quick attach or telescoping ends really come into their own.
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