The arguement of whether to raise or limp behind the limper depends on the opponent. Anyone who favours one line to the other is an autobot and will be leaving money on the table. To make this clear: if you ALWAYS raise limpers, you're doing something wrong, and if you NEVER raise limpers, well - you're also doing something wrong. Spoon's article is a great read and I wouldn't pass on reading this if you already haven't. Even if you have, it's worth a re-read:

http://www.flopturnriver.com/phpBB2/...rs-t66631.html

In this situation we can't say whether limping behind was preffered over raising because what do we know about our opponent when it comes to postflop play - which is a huge factor in determining which line to take.