Tamron 90mm macro users

I guess this could also go on the lens discussion board, but I would like a view from macro users that are likely to use this more than most...

Do you consider any of the following to be a reason not to get this lens over the Canon 100mm.

• The length it extends to when going to 1:1
  
• The speed/sound of the autofocus for regular use; I would like to use it as a regular lens for family shots (including kids running around etc.)
  

What is the price for this lens? Is it comparable to the 100mm Canon or 105mm Sigma?
I would seriously consider the Canon or Sigma before making and purchases.

It is pretty much £100 (around $200 I guess) less than the Canon. Initially, I was planning on the canon, but with a lens hood and lens case included, the price difference (which is almost a 430 ex!) and the reputation of its sharpeness/resolution I'm extremely tempted by the tamron, providing the issues I have mentioned are not seen to be that great an issue during regular use.