I personally use the TRX and AT Propointer. Notka and Makro are now the same company, but each product is different. I've never used the Notka, but the Makro works fine.
I have had my pro find about 2 or 3 years now and really like it. Just keep this one thing in mind, it is not fully submersible. If you plan on doing any water detecting then you might want to consider something else.