Review by Splatterdash:

• Binder Model: Underworks Double Front Compression Vest
• Manufacturer Website: http://ftm.underworks.com
• Cup size at time of use: B
• Ratings: 
• Comfort: 4/5
  Chest doesn't hurt in the slightest either whilst wearing it or once it's taken off, but the bottom hem has a tendency to roll up and dig into my hips.

• Effectiveness: 4/5
  Not perfect, but as good as bandages without the lasting rib-ache. Worth noting that it also slims hips a little if you wear it pulled all the way down.

• Discreetness: 5/5
  Nobody can tell you're wearing it under your shirt, and it doesn't look much different from a normal vest. I would advise, for better passability, to wear it with a sweater or jacket over the top, since with just a t-shirt, there's still a bit of a bump where your chest is.

• Overall: 4.5/5

Review by Malakoi:

• Binder Model: Underworks Double Front Compression Vest
• Manufacturer Website: http://ftm.underworks.com
• Cup size at time of use: C
• Ratings:
• Comfort: 4
  It's movable, isn't itchy and doesn't hurt or cause unnecessary pressure at all. It does tend to roll up or bunch at the waist when I'm sitting down.

• Effectiveness: 3.5
  If I wear a tight shirt, which I normally do, it looks like I have compressed breasts because I do. I have to wear two shirts or a sweatshirt to hide it.

• Discreetness: 4.5
  The seam around the top is sometimes noticeable under tighter shirts, but the binder is normally invisible.

• Overall: 4

   

Review by Kaori_P:

• Binder Model: Underworks Double Front Compression Vest
• Manufacturer Website: http://ftm.underworks.com
• Cup size at time of use: D
• Ratings:
• Comfort: 4
  It's very comfortable, enough that it's easy to forget I'm wearing it. I have their current longer model and the older short one. The short model I'd rate a 5 in comfort, because the longer one can roll up and really hurt my hips. Both models, however, completely ease back pain.

• Effectiveness: 4,
  It's not perfect if I wear a tight shirt, but it looks enough like pecs that I don't have much trouble. I'm sure if I were more muscular it would look natural. In baggy clothes, it's wonderful.

• Discreetness: 4,
  You have to be careful the binder can't be seen through sleeve openings or if you bend over and your shirt lifts up in the back to reveal it. Otherwise it's pretty much invisible. I've never noticed unnatural bulges from the fabric in my clothing.

• Overall: 5,

Definitely a good binder. It's effective, comfortable and does the job for about $30 plus shipping.

Review by sinspyre:

• Binder Model: Underworks Double Front Compression Vest
• Manufacturer Website: http://ftm.underworks.com
• Cup size at time of use: A
  
• Ratings:
• Comfort: 5,
  Most of the time I can't even tell I'm wearing it, unless I shrunk it, in which case it goes down to a 1. Seriously, if they're too small, they cut into you and your boobs pop out. So... get one that fits. :P
• Effectiveness: 5,
  It makes me totally flat.
  
• Discreetness: 5,
  Looks like a beater if you can see it through your shirt. Otherwise it passes as underarmor. Also great for swimming in.
  
• Overall:  5/5