I've had experiences with Subway that are good and bad. It all really depends on your request. As for the weight loss bit Subway has been pitching (great marketing BTW), what they don't tell you is that when Jared was on the "subway diet", he would walk from his apartment and take a roundabout route (30 min to an hour) to the subway, eat there, and walk the same route back. Eating a reduced calorie meal alone isn't going to help you loose weight. Another suggestion that I've been using for almost my entire life is drink a glass (16 oz) of iced water before the meal and eat until full (obviously not junk food). The water has a filling effect on the stomach.
Togo's (west coast based chain) has excellent subs also.
Good luck on the 20 lbs.