OK, my Mods were weds, thurs and fri of 9th when I did them (3 years ago... I feel old just thinking of it).
What I do remember is that the latin is difficult to deal with at first but when you think about it you probably didn't really know what 'the rule of law' meant in September so it's just the same as that.
I don't think I've ever read Zimmerman as I don't really remember doing much work or indeed knowing anything about Roman law, but I'm studying in his home Uni this year so I've heard quite a lot about him and he's meant to be one of the most knowledgeable people around on Roman law- I think oxford wanted him a couple of years ago but he turned them down. He's probably worth reading on that basis, but that doesn't mean he's understandable...
Oh, and Embers, you're at SEH so I can safely say that your opinion on Constit probably has more to do with your tutor and has rambling ways than the acyual subject (though Bradley and Ewing probably doesn't help...) Do you guys still get Mr Hackney for Roman? He's an experience...