Join Date: Mar 2005
Location: SF Bay Area, California
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I've never been a fan of the combo deals, but they have their place.
My experience has been that the platform interferes with the binding mechanism, making them a not-so-great clip in pedal. But at the same time, I found them almost impossible to step on as a platform and NOT unintentionally clip in, making them a poor platform.
There are also the flip-flop combo units, such as the 324, but they are compromised as well. The binding mechanism on those stinks (similar to a 515 or 505 pedal I'd guess), and is very "sticky" to engage and have a soft, undefined click-out point. Additionally, the platform is not very grippy and the there is no default side UP -- that is, when you put your foot down on the pedal, you'll never know whether you're going to get the platform side or the binding side.
That said, I put up with a pair of 324s on my commuter bike because I like the utility, and use non-platform clipless for everything else. In the tool box I have a pair of agressive platforms I can install at a moment's notice.