I use Market Samurai and find it simple and easy to use.

I've seen other desktop apps for tracking rankings and they would make a UX designer cry. I don't know how fully featured Market Samurai is, but it does everything I want it to do.

My concern about desktop apps was that it could get issues with Google (eg: getting banned based on IP etc). Did anyone meet such an issue ?

Thanks otherwise for the comments on this product, I will give it a go!

you can use proxies with market samurai (admittedly, the way they handle proxies is awkward, but overall, you can avoid google issues completely with a handful of proxies)

Totally agree, best money spent in a long while