I think I am leaning towards making use of the discount. However, it seems a little short on Lancashire records, which is where most of my lot are from - especially what is now Merseyside. The free search suggests there are little or no church records from the Liverpool area, as opposed to quite an extensive Liverpool resource on Ancestry.
I am pretty experienced, I've been at it for 10 years and have 12,500 folk in my tree (and some professional research & radio genealogy advice work), but the extent of my research is partly what's tempting me - tracking down some of those annoyingly elusive people. I also have a few merchant seamen amongst them, and these records are in FindMyPast (key people I have through the National Archives, but others are missing). I'm also hoping the probate/will information may throw some extra information up.