Focusrite Scarlett Solo is a simple 2 in / 2 out USB audio interface featuring a headphone amp, stereo line-out with RCA connectors to connect it to a pair of active monitors or an external amplifier, and a mic/line input for recording purposes. Great for people who want a simple stereo set-up, or who want to set-up a small home studio for music production or podcasting, but in case you are looking for a general purpose sound card for gaming and home theater use, there are better alternatives.
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Pros
Pro Included software bundle for home studio
The interface includes a bundle of software and other content, including Ableton Live Lite 9, Softube's plug-in bundle, Focusrite's 'Red 2 & 3' and 'Scarlett' plug-ins, Novation's 'Bass Station' and 1GB of Loopmaster's sample content.
Pro Easy to adjust levels
The gain/volume knobs are easily accessible on the front panel.
Pro Low latency
Low latency is especially crucial for people who use DAWs and other recording software as longer lags in the audio playback/record would result in quality issues and general irritation. This interface promises zero latency, but the actual latency depends also on other aspects of your set-up, such as processing power, hard drive read/write speeds, software and, at least in theory, the length of the cables. The latency issues can be compensated with the software, as the playback can be delayed by the amount of latency perceived, thus eliminating the problem.
Pro Sturdy box
It's good quality 0.6kg box, meaning it's quite sturdy for the price. This is great especially when using heavy-duty cables.
Cons
Con Headphone amp
The headphone amp is enough for low impedance headphones, but it might struggle with headphones with >100Ohm impedance.
Con Only analog i/o
This interface doesn't include digital inputs or outputs which might be a disadvantage for some users.
Con Only RCA-line outputs
The outputs are provided only in RCA format, which is not a crucial since it's easily remediable with simple adapters, but usually in these kind of interfaces one might expect to have also 1/4" jacks.