So I just received my Tennmak Crazy Cellos, and boy, they're prodigious. OOTB, I am very impressed. I can say that it's like as if **** 4in1 and Havi B3 Pro 1 had a child. It filled the missing spaces of the two aforementioned IEMs.
Sub-bass is present and adds a nice touch while maintaining balanced sound. Mids are impressively clear and detailed, and as a vocals head, this is the best I've ever listened to. By combining ****'s harsh treble (IMO) and Havi's rolled-off treble, you got yourself a sparkly, detailed, and airy sound without sounding too sibilant and harsh. Soundstage is almost Havi's in terms of width, depth is not much I think but still enough. Separation and imaging are almost Havi's as well. Instruments are nicely separated and can be pinpointed where its sound's coming from. If there were any downsides, it'd be the driver flex my unit's right piece has, and the difficulty of seeing left and right markers.
Most people said that this is tip-sensitive. I agree, changing from these tips to those tips makes a noticeable difference. Biflange are the most recommended, but I have yet to try.