I struggled to find information on virtual amps when I was looking, so I'll give some extra details after talking about the product.
For someone looking to use a PC as an amp, this is amazing. It has over twenty virtual amps, and a shiteload of effects. On top of that, they have about 500 pre-set sounds for songs you might want to try playing. There is no audible delay unless you put on a cab. If you ever hear hissing, it can be sorted 99% of the time by adjusting the various gain and volume knobs on the box itself and within the software. You can even plug in and use a bass (they have bass amps) and it works with minimal/no hissing. The software works on my desktop PC, and on my mac laptop - so if I really want to, I can use it as an amp on the move. It also acts effectively as a guitar and bass amp, which saves a load of money on buying separate amps. For bedroom players, you can't ask for much more.
It only gets a 4-star review for two reasons. The software support hasn't been great, especially with the switch over to windows 10. The site organisation is just kinda awkward. Also, the song pre-sets aren't very well organised. They could have titled them as [Song - Artist] but they just put the song title or a related phrase.
The system comes with 6mm jack sockets on the front for the guitar and headphones. So if you have a standard 3mm headphone jack/speaker wire, you need to grab an adapter off amazon for a couple of quid. The guitar plugs straight into the left socket. Headphones/speakers go into the right.
The guitar signal goes into the box, which feeds through USB into the PC. The PC software (Pod Farm 2) processes the sound and adds on whatever amps/effects are needed. It sends the processed sound back to the UX1 box, where you connect your headphones/speakers. I plug my surround sound in, so it plays through those. If I need quiet, I switch that out for some headphones.
Yes this is a pain in the you know what to get set up, my Management Accounting exam was easier, but it's worth the hastle. The sound that comes from the device is amazing and the selection of amps and effects is enough for most artists although there are options to buy more.
If you're on Windows 10, like me, you need to search for the Ux1 driver, download that from Line 6 then run the updates.
I was about to buy a Blackstar TVP 30 but my wife wasn't happy with me making too much noise so I can now practise with my headphones on.... You'll need a 6mm jack for those if you haven't got one. As a U2 and Hendrix fan I was able to get both the delay of Edge and the Hendrix wahwah from the bundle that's included. Very impressed.
Served me very well the last couple of years. It was a bit fiddly to install the drivers and synch it up with my recording software but once set up, it was very easy to use. One tip: make sure you totally deactivate your built in computer soundcard when setting up; this will replace it.