I have big feet, generally I wear a 12.5-13 EEE, so finding shoes that fit comfortably for me is quite a challenge. That's one thing that kept me from cycling shoes so long, I couldn't find some that fit well on my monster feet. I was surprised when i stopped at the LBS and they told me to try out Bontragers, being as many long-timers here know, not much of a fan of Bontrager .
After trying on the base "MTB Race" I was shocked, they fit very well on my feet. Granted I had to go up to a 49/14.5 as it seems they run about a size-size and a half small, but I had just enough toe room,a nd the toe box is wide enough that I had a comfy fit. I bought 'em the next day.
Well.. those after two rides had a situation with the sole that didn't work well with me. YMMV, but I couldn't stand them. So I ordered the Bontrager RL MTB. A little, by a hair, narrower but a great snug fit. I've put about 50 miles on 'em in the past two and a half days, and I can't say enough good about them on the bike. They have a REALLY rigid sole so they're lacking in the walking around department, but oh man are these going to be great for long rides. Here's some more thoughts:
Summary: I'm converted. The stiff sole makes all the difference in the world, clipless is fine - I don't notice a huge difference yet, but they aren't bad - and I'm a big fan. If you have big feet like I do, I recommend trying them out. The price is pretty dang steep, but shoes are one thing I never skimp on, I've had enough days with sore feet in my life..