I think it's good....

because, It helps SEO to determine what they should do more on their KW and to

their site to increase it's traffic....

OK, this is a discussion near and dear to my heart. Or brain.

I have a rule, not totally articulated, but I keep the concept in my mind nonetheless. OldWelshGuy is right on the money in fact. Here's my rule: "Commercial tools are generally not as effective as custom-coded tools."

Now that I've said that, let me say this (contradictory) statement: I use (or have used) a few commercial tools that are indispensable. These are:
- SEO Elite
- YACG Mass Installer
- SimplifiedSEC
- WP-O-Matic
- Domain Dashboard
- ...plus a couple others

But for the most part, I RELY on things I created myself. They just work better. Plus they don't get abused, and banned/shut-down/made ineffective.

For instance, I started coding what has become a series of tools which I call Weasle. Weasle originally stood for Weasle: SEO Link Engine. A silly name but some of the things the tools do are kind of "weaselly". It has taken me probably a couple hundred hours over the last year and a half, as I've created, developed, refined, tested, and used Weasle.

But it works. And no one has anything just like it.

It has a site analyzer which I made, that measures exactly what I want to know about a site. It has a Digg tool. It has an article poster tool, which posts to one of many many blogs (at random, sorted by topic) via XML-RPC. It has a ping tool, which pings various locations on a regular basis.

It does every single task via proxies as well.

I've had great success with it, in promoting my own sites, just because it stays low-key and because it does a few things very well.

And creating something like this was hard, but it brings me a lot of satisfaction to use it and see it work. So I like custom tools, a great deal.

(But SEO Elite is great, too.)

I found the free demo of the IBP/Arelis tools to be useful. The ranking checks are very handy and the advice given with regard keyword densities and position for meta data is also helpful to beginners in SEO.