I too at first wished they had the changeable coil option for the Compadre when I was buying a new one. Then I thought, well since I hunt trashy land areas and I typically am a small coil user, why not give it a try, after all, looking about the Compadre on Findmall has some pretty satisfied users. Then either I'll like it, mod it with a connector to enable coil swaps, or get rid of it.
I ended up liking it and liking it the way it is. Sure it would me nice to change coils, and I could still do the connector mod, but then again I'd probably use the 5.75 coil 95% + for my use, so then it became no big deal, and I have several other detectors and additional coils for those anyway.
I just wouldn't let the fixed coil become the deciding factor on a purchase. At it's price point, they kept it affordable and although its not loaded with bells & whistles, they did make it effective and didn't cut down on the warranty.
I thought I would do the connector add-on, but it just didn't happen. I would do it if I felt I really need it, and yes I would have paid extra if they had it already done, but no matter, I have no regrets on the purchase. Not disagreeing as it would be nice, but I imagine they did all they could to keep cost as low as possible without sacrificing quality and warranty.
Now if I was mainly a large coil user, I'd mod it or buy another model to fit my needs.