When I boughy my first road bike a year ago, the salesman urged me to go clip ins. Due to my sasquatch feet (14 - 4E) I couldn't find shoes that fit. He luckily had one set of Shimano shoes that he said he special ordered for a secret services agent that never picked them up. He said he would throw them in with the sale of the bike for $50, so I jumped on it since I wasn't sure if I could find my size elsewhere.
At any rate, they fit me. A bit narrow, but the length was good. But they were apparently MTB shoes with a SPD cleat and hard soles. I've been happily using them for the last year with these pedals:
I can get in and out of them easily. I don't get an hot spots or weirdness in my feet. My knees don't hurt. Sometimes, I notice my left shoe will creak a little when pedaling if I have my toe turned out, but once I straighten my foot, it stops. I've considered getting a two sided pedal simply because I don't ride my bike without clipping in anymore.
Since starting to do more group rides, I've noticed I'm the only one on a road bike using this style of clip in. I'm perfectly happy with them, but wondered if I am missing something by not using another style.
From the little I've read I see there are SPD, SPD-SL, Look and Speedplay systems at least, possible more.
Being that I've used my current shoes/pedals for a year with no issues, is there any reason to drop a big chunk of change to get into one of the more standard road clip in systems?
Side Note: The Garmin power meter pedals have made me wonder about switching to a Look style shoe as well.