Pros: Small (Like others have stated, this unit is small, so small that people will think you are talking to yourself.)

Ambidextrous (The unit will work on either ear)(Just turn the earpiece to the side you want)

Cons: I don't really have any cons about the device except for after 2 years of abuse and constant use it does fall apart, but then again how many other devices do you know that can go through 3 cycles in a washer (device and charger) and still come out working again after drying.

Other Thoughts: Like I stated in the cons, I used this device every day for 2 years listining to music and watching movies and making calls. Battery last 5 hrs when you first start off and dwindles down to 4 avg while watching movies and 4.5 listning to music.
The device charges in 15-20 min with just the case and in 10-15 min with case pluged in.
After constant use through out the day, my ear was hurting a bit from where the earpiece was sitting, bit my ears are kinda small.

If you are wearing sunglasses you may want to put them behind or outside the earpiece (depending on the thickness of your sunglasses earpiece) I had Oakley Radar sunglasses and had to put the earpiece on the outside of the device to make it confortable.

Overall I would recomend getting the Gen2 Sliver because the part that goes into the ear seems a little stronger and well built, but if you dont want to spend the money and only need a single ear BT then get this one.