The X1 Slim is Chatterbox’s (and this comparison’s) most expensive, highest powered, and longest range offering, and it excels at all of those things. It offers tremendous range (over a mile, even through obstructions), and loud, clear sound from the speakers. The X1 Slim also uses a simple knob for on/off and volume, which is refreshing compared to fiddling with small, rubber-clad buttons. However, the system works like a walkie-talkie, where only one person can talk at once, which means either using the voice-activation feature (VOX), or pushing a button when you want to speak. Neither option works well or is acceptable considering the competition offers the ability to speak and be heard at will, and even talk at the same time. The unit itself is also clunky and relatively heavy, so it won’t slip in a jeans pocket when the helmet is locked to a bike. It is undeniably more powerful than any other system we tested, but it constantly reminded us that it is an evolution of older tech rather than something new, which puts it at the bottom of our list.