I use the metronome/tuner for guitar practice.
For the price the product is good, it has a lot of features and is easy to start using right away. However it has a software problem with tuner, where it would show a completely wrong tone until the battery is removed - which fixes the problem for a while.
Pros are ease of use, design and features. Really big display makes it really easy to see, and it is really bright with decent viewing angles (except from above, those aren't good). Sound output of metronome is decent and allows for practice, but is a bit quiet if you're practicing drums (need headphones + mufflers). Case is robust and looks nice. It is fairly easy to figure out without the use of manual. Tuner is full chromatic (with different modes for guitar bass etc.) and metronome has several rhythm modes. You can plug your electric guitar to tune (silently) in noisy environments.
The con is the bug with tuner showing the wrong tone - it has happened to me several times now on 3 separate units I've bought (I own 4) - hence the 'okay' for quality. Removing the battery for 10 seconds fixes the problem temporarily. The tuner response is a bit slow, but I haven't found it to be an issue.
Overall good!