I have a copy of Recorder 6 that I bought in about 2008 but I should start by saying I have not used it for at least a decade and have not kept up to date with improvements, so if any of my criticisms no longer apply, I would like to hear. That also means I can’t remember all the aspects I don’t like about it.
In the link you provide, you’ll see it says R6 is the “ultimate tool for those entering, collating and exchanging records” - so it is fine for formatting them and passing them on, but makes no claims to being a useful database for holding and interrogating records.
The biggest problem I recall is the species dictionary. In Recorder 3 (good Recorder) there is one species list covering everything from algae to birds. Each species has a code that places it in its taxonomic position. It has its national status (Common, Endangered etc.) and space for a paragraph describing its ecology to which you can add literature references so you build up a bibliography for the species. Every few years an updated species dictionary would be issued and if you didn’t want to wait, there is the option of adding new species yourself.
In Recorder 6 there are dozens of species lists, some covering a taxonomic group, some based on a particular book such as a Red Data Book, some consisting of a particular organisation’s checklist. So if you want to enter a record of the beetle Elmis aenea, you will be offered five species lists from which to select it. And Recorder 6 doesn’t recognise that they are all the same species. But R6 is not consistent. The hoverfly Platycheirus clypeatus has gone through several splits in the last 30 years so the name means different things in different checklists. But Recorder 6 treats them all as equivalent.
Recorder 6 has no equivalent of the species description and bibliography. The most annoying aspect of the R6 species dictionaries is the lack of an overall taxonomic code, so if you want a list of species for a nature reserve, you can’t get it in taxonomic order.
I can’t remember all the other problems. Simple jobs like getting a list of species for a site take a few key strokes in R3 to get a list on the screen, whereas R6 requires you to open what they call Report Wizard. I went on a training course and by the end of the weekend we had all agreed, including the tutor, that it was not fit for purpose. The water beetle recording scheme switched from R3 to R6 and went back to R3.
I am aware that Recorder 3 is difficult to run on modern computers. My laptop is 13 years old and uses Windows 2000. When the laptop packs up, I worry that all the effort of inputting my data will have been a waste of time, hence my wish to transfer to a modern equivalent.