depends on what you are checking - I've only looked at the 1911 copy for marriages upto 1820 and bapts around 1800-1820 I think for bride which appears to be ok - there are many 'als' entries that didn't make it into IGI and of course the parish clerks sidenotes are invaluable (I assume these will be added to any new transcript ?)
I have a transcript of 1841census only noted a few placenames as difficult to read