Should I have waited for one of the Admins to welcome you to the forum? Umm, for a difference of $69 from kellyco for the Tpro, that isn't a vast amount of money. Uhhhh, you get a DD coil when you get the Tpro. The Tmaster is only a concentric coil. That is a big difference. I don't often use the backlight, but it is a good thing to have and has come in handy a few times. I stick with the 4 tones, even though I have the 8. The reason I don't use the 8, Is because I go to heavily iron infested areas where the falsing causes more tones to be just a nuisance than a help. I only need to pay attention to the iron clicks, grunts, and the positive VDI. The reasoning is only because of the places I hunt. If I hunted more parks, then I might benefit from the 8 tones. The DD coil is prob the reason why you would consider the extra for the Tpro. I have done quite well with it, despite the limitations I have noticed. It is a decent machine, and if you learn it well, and learn the type of places you hunt, you will be able to find some decent things with it.