If you scroll down halfway on the Teknetics page, I have an in depth review written on the Eurotek Pro with the pros and cons....It has the 8 inch concentric coil...
Don't want to go into detail here but I found this little inexpensive detector to be really impressive....It has great depth, very accurate ID, large numbers, lightweight, and is easy to use...Doesn't seem as sensitive to EMI as I thought a teknetics would be....You can reduce the volume of the iron audio while looking for the goodies...The only things I didn't really like and it seems common is the ability of it to pinpoint accurately if the target is shallow...It will say 3 inches when it is only 1 inch down....Didn't like the flimsy screen and it would be advisable to put a screen protector on it or get the rain cover because it would be so easy to scratch it....But all in all, it is worth the money! A real pleasure to use! Good Luck!