original Classic ID in that it uses the same two-knob adjustment (Sensitivity and Discrimination), and the same visual TID circuitry. It comes with an 8" diameter coil like the original Classic ID did, however the Classic 4 and Classic 5-ID were designed expressly for Kellyco and have some electronics changes that make them operate at about 8.1 kHz, like the Prizm series, rather than the 6.59 kHz of the rest of the Classic line.
They use a Prizm series coil and there are only two coils available foe them. The 8" or the 950. The early Classic 5-ID came standard with the 8" and the latter models with the 950 standard. Using an early release Classic 5-ID for a field evaluation and since that time I have found coins to 7"-8" depth range with the 8" coil.
None of the Classic series have a coin depth read-out, but to tell you the truth, I very, very seldom use that function on any detector because they can be quite inaccurate based upon various settings.
Like and dislikes? Well, I like the fact that the 5-ID operates at a different frequency because it allows two people to hunt close together with similar models. My friends, Chris & Aundrea, bought the 5-ID I evaluated from Kellyco so they could hunt close together since Aundrea uses a Classic ID.
While it works quite similar to the Classic series at 6.59 kHz, I have noticed a little subtle difference, but I use Classic's a lot and have for over a dozen years. I prefer the Classic ID to the 5-ID mainly because they make use of all the Blue Max series of search coils as used my the XLT, XL Pro, and the Classic III SL and IDX/IDX Pro. I favor smaller coils and only own and use a 6