Well, I've had the 4.5x7 on for almost a week now. It's not enough time to post a review, but I feel it is enough time to post my initial thoughts. Yep, it gets into tight spots. It picked a Silver dime out of a yard that is infested with square nails. The stock coil missed it repeatedly. Now, for depth....maybe the coil just didn't get over any deep targets, but everything was 3"-4" or less. Was using ttf with open screen and manual 28. I hope this is not the best this coil can do! Starting to get worried, but I'll give it more time.
Remember this can be an addiction with this hobby....... but it is fun !!