Ziplex Z20

I am considering getting back into mining again. It has been a few weeks since I did any real mining and a couple of months since I hit my "lucky" streak.. A 1000ped tt streak in about 3 days which encompassed my highest ever find 394ped Blausarium if memory serves me correctly. The of 211(l) I had been using dried up on me a long time ago and therefore I have decided to look on auction in the hope of finding something better suited to my current skill level. Which is level 7 prospecting or so. I had reached level 10 in the past but made the mistake/wise choice of chipping out and starting again. I still find it painful to see cga in red...

Anyway I was searching auction tonight and the best orefinder suited to my current skill level was/is the Ziplex Z20(l). It has a max search depth of 552.3 which is more favourable than the 211(l) I am using. There's only 1 snag. The price tag! With a tt of 126.20 and a markup in the region of 500%+ I am wondering whether it truly is worth such a hefty investment. Having never used one in the past I am unsure and am a little unwilling to put it to the test right now. The crafting friends i've talked to don't seem to have the bp. Although a high sliiked crafter I know has offered to click the bp for me if I found someone with it. Now I find it highly unlikely that someone with this bp would "loan" it to me for 2 reasons:

1) The fact that this must be a very valuable bp and I probably wouldn;t be able to offer enough collatoral.
2) They would want to click it themselves and charge the high markup it has!

So I will shelve this idea for now and contemplate it some more. Who knows maybe i'm missing out on some Gold/Platinum/Rugaritz finds. Or maybe this sucker still isn't good enough to hit these sorts of deposits and I would maybe only find copper or something. Or maybe it is that my skill level isn't to the required level to find such highly sought after resources...