But they have also good previous systems.

Sad thing is that they don't have models with mobile reciever.

Featuring 24-bit precision for a full frequency response of 10Hz to 20kHz and a wide dynamic range of up to 120dB (A weighted), the signal from an XD-V75 digital wireless system is so clear and strong that it sounds and performs as if you’re using a wired microphone.

Unlike analog wireless systems, XD-V75 digital wireless systems never use signal companding to compress and expand the signal, so you always have full dynamic range. XD-V wireless systems allow you to convey every nuance of your performance to the audience in the most natural way, with crystal clarity.

XD-V75 systems operate in the 2.4GHz ISM band, which is free from interference due to TV broadcasts, white space devices, cell phone towers and other transmitting devices.

Line 6 digital wireless systems use exclusive digital technologies to protect their signals from interference that can wreak havoc on analog wireless systems. Encoded DCL™ (Digital Channel Lock) technology distinguishes XD-V75 digital audio from any other third-party signal, including Wi-Fi, thus preventing reception of audio interference from other 2.4GHz devices.

More info: http://line6.com/xd-v75/features