Is Market Samurai Worth Buying?

Depends on what you're looking to do.

I have used market samurai extensively for seo related projects... helps me find keywords, understand competition & what's needed to gain a top position in the serps. It's great for that and I highly recommend it if your business relies on serp traffic.

My main income generation does not come from getting serp traffic, I get my traffic in other ways... and for that part of my business i use other tools.

Peter