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My (professional) opinion is that the main benefit of side gapping is for the place that sells you the plugs, since they will wear out much quicker.
A correct, properly gapped spark plug will ignite your air/fuel mixture just fine.
If you want to pretend to be doing some cheap high performance mods, you'll do better to index your plugs.
Though the benefits to a stock or slightly modified engine are most likely psychological (just like side gapping)
Guess you haven't tried side gapping are you wouldn't say that the benefits are psychological. It's not psychological that I no longer need to use my choke to start and that it idles smoother right off. I know my motor and there is quicker response to the throttle without a doubt. As far as the plugs wearing out quicker I don't think so. I have had mine in for two years and they show no signs of wearing out. I will however, install new ones next spring anyway. I also know that there are a lot of guys on this site running side gap with similar results.
if life gives you lemons keep them because hey,free lemons.
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