It's okay for home to record some demos but definitely not for something serious. Overall, I would recommend it because the ratio between price and quality is still good but not for professional recording use. The screws are around the 1/4' jacks, so you can untighten them and then rewire the USB connector on the printed circuit board. This interface CAN be opened and fixed even if it doesn't look like this.

So if anyone else faces the same problem: It may happened only to me but the USB connector broke after few months of usage. Pre-amps are okay, I love the VU meters, it's literally one of the most useful things of the good old analogue days, so you actually see what's going on without having thousands windows opened in your DAW. The only drawback (but it makes sense) of the software is that it doesn't work with other interfaces. So if you put some time in it, you get a good result. So I used it as a VST, put it on one channel in my DAW, put EQ, compressor and high-pass filter (when needed) on it and I got decent sound that was comparable with previously mentioned programs. Maybe it's not Guitar Rig/Amplitube (it depends what you prefer) but when you find out few tricks you get a decent sound. Simply plug your instrument into the 1/4 guitar input, launch GarageBand, the free Line 6 Mobile POD app, or another CoreAudio app, and start playing. It works as a standalone program or as a VST.

Built on the technological foundation of the studio-standard POD XT and Bass POD XT direct recording devices, GearBox provides a hardware-like, simple to understand and operate interface for dialing in the perfect tone. Software that comes with it is quite nice. GearBox is the Line 6 software that gives the TonePort UX1 and UX2 hardware interfaces world-class studio tone on the desktop. When I bought this interface, my main intention was to get something to rehearse in the apartment during the night and to record ideas at the same time.

Line 6 recording interface