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The Sigma EX 150mm f2.8 is quite affordable and should be better and definitely more convenient than extension tubes.
Personally, I'd take a macro lens over extension tubes, but I guess your mileage may vary.

• The/a Sigma 150mm gives a wider FOV than my EF 70-200mm f4 L USM. I'd need a 1.3x TC.
  
• The Sigma 150mm weighs 63% more.
  
• The Sigma 150mm can/does not double a 70-200mm zoom lens.
  

I do not take macro images with my 70-200mm f4 L USM, but close up images. "Dealing" with a 12mm extension tube is not a bother to any stretch (which is what I use with it when wanted). 

So, if you'd rather take 150mm than 200mm, 1150 grams rather than 705 grams and extra lenses to cover the 70-200mm range, your mileage indeed varies a lot...

My issue with this new RF 70-200mm f2.8 L IS USM (disregarding price) is that you do not get a "200mm" FOV at closer up distances, but wider. Not a new issue, it was my issue with the Nikkor AF-S 70-200mm f2.8 II, the Tamron 70-200mm f2.8 and Sigma 70-200mm f2.8 too. It seems a bit odd to advice me to take a look at a 150mm lens which for sure gives a wider FOV, instead...