Pros: When I first received my M-Duo, and opened the upscale packaging, the construction of the M-Duo really impressed me. The headphone itself is all metal construction, with a built in microphone/control switch on the cable. The headphone jack has a unique right angle designe..very easy to insert and remove from whatever device you might be using. The cable itself is supple, and I noticed almost no microphonics (annoying rustling and thumping noise when the cord brushes up against something). There are nice strain reliefs on the headphones, microphone and headphone jack. There’s also a rather nice zippered storage case and several sets of silicone eartips included with the M-Duo. The range of included eartips, make it easy to find just the right fit for any ear. My first impression, when listening to the M-Duo, was that I was hearing my music library in a whole new way. Subtleties that weren’t apparent with other headphones, came to life with the dual drivers. The bass driver, giving a solid, full bass, and the tweeter giving sparkling highs, as they both mixed together to give mid range tones that I’d never experienced with a single driver headphone. I have a rather large collection of single driver headphones, and the difference in sound between a single and a dual driver is remarkable. These are true audiophile quality. I can tell you from experience, that MEElectronics doesn’t just sell you a product and forget you. The customer service is the best I’ve ever experienced with any company. Any questions about the headphones, to their full one year warranty are are handled in a prompt professional manner. If you are thinking of buying a real audiophile quality headphone, I’d highly recommend the M-Duo, from MEElectronics. The M-Dou has high quality construction, is very comfortable to wear, and has sound that rivals or even exceeds headphones costing twice or three times the price.

Cons: Haven't found any at this time.

Pros: Listening to these buds, you'd think they were traditional wired earbuds. The sound quality is excellent. With 10 mm drivers, you get a full robust bass, and yet the mid range and high end still come through with great clarity, even on high volumes. These are beautiful, with a flat cable connecting the earbuds, and a built in mic, that includes the volume and power switch. Slightly raised buttons on the volume control/power switch make finding the correct button easy. The internal battery is charged by hooking up to a standard USB port, and an easy to attach clip to the right earbud. There's an LED on that earbud, that shows red while charging, and blinks blue when paired with your Bluetooth device. It even puts a small icon on your device that shows the charge level of your earbuds. Very useful if you are unsure of how much charge remains in your earbuds. The Air-FI Metro, really has the sound of high quality wired earbuds, without the cords, and it allows you to control several functions on your device, by using the control buttons on the microphone. I've found that MEElectronics doesn't forget it's customers after the sale is made. Their customer service quickly responds to questions, and gives personal attention to any concerns. I would absolutely recommend the Air-Fi Metro to a friend.

Cons: As of this writing, I haven't found any cons to report.