The 228 is a traditional unipivot design. The 242 is a "modified" unipivot in that it has two pivots and behaves like a more traditional gimbal type arm if you believe the advertisements.
Actually the Hadcocks work well with most cartridges not just high compliance cartridges. I am using the 242 with both a Zyx Airy3S LO SB and a Cartridge Man Music Maker 3; both sound terrific and track flawlessly in the 242. A popular misconception is that Hadcocks have low effective mass but at 11.4 grams for the 242 and 9.1 grams for the 228 they should be considered medium effective mass tonearms.
I agree with Audiofeil, the old Hadcock 228 works surprisingly well with stiffer carts too. I've tried an Ortofon MC30 super in it with good results. Have not tried the Denon 103 in it though. I would not call it a traditional unipivot since the "needle" goes into a bearing with 4 balls. Mr Hadcock tried a 3 ball bearing as well but found that 4 balls gave a better result. The arm is a b*tch to set up though...
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