Any Mengs LRT recommendations?

[guardian]

Mengs offers the various LRT (filter ring repair) options:

The LRT-06

Click here to see on Ebay

The LRT-07

Click here to see on Ebay

and the LRT-08

Click here to see on Ebay

There are size differences and so forth. But it's not obvious to me which of these is the best first to purchase. And I'm wondering:

Do you really need to own all three?

Anyone have experience with these tools. All recommendations and advice would be welcome.

ETA

Uh, I'm not actually seeing the Mengs insignia on that LRT-08 in the photos. Is that a genuine Mengs tool? I dunno.

[Gardener]

I have the 06. It's a nice tool to have but you need to learn to use it, it's not like it will make your lenses look like new all on its own. I suggest practicing on cheap throwaway lenses if you decide to get it and learning how to apply proper amount of torque. Manufacturing quality is ok, but nowhere near what you see from major brand name manual tools. Also, it's poorly balanced, and I wish they'd made it with left hand threads.