I do have a subscription, but I think I will let it lapse now that it is coming up for renewal for the third year. Partly I just have the Zeiss lenses I want for my D800, and know which are the ones I might add, and partly I have just learned much of what he has on his site on my own accord.
I never had a problem with the pay model.
I would recommend that if you want to get up to speed on Zeiss lenses, or if you are looking for detailed information on how to make sharp photos, or if you want access to reviews of some oddball high-end equipment like the Pentax 645D or the Leica S2, then it is worth a one-year subscription, and after that you can decide yourself if you want to renew.
I hesitate to say this, given that he apparently has friends here, but I do feel that his approach has slipped a little in the last year or so. I feel that he is less careful about presenting the facts in a neutral way, and has moved more into an editorial style, where his opinion is given more free reign, and therefore I don't always find what I am looking for, or I am sometimes less keen on the delivery of the information. This clearly does not ruin what he has built, but it does make it a bit less interesting than in the past to subscribe. All in my opinion only, of course. Still a good deal for that first year, if you need what he has.