The software is £475. We also have a hand held stock recorder, which is £1,525 and includes the software. This means you can input whatever you need outdoors by tag, for instance say you are going to dose for fluke with X product, then scan tag of each sheep you've done. Or record births by scanning the mums tag, then scanning the lamb's/lambs' tag in the lambing function (having already said which tup the sheep has gone to).
We are finding it very useful. We applied for an SRDP grant and also got the three way automatic drafting crate, and a new sheep shed, which isn't actually up yet, although the founds are in. The grant covered 60%, and we were encouraged to apply for the Shearwell kit too on the basis it made the whole proposal more likely to be accepted as it showed we were taking our business forward (although we are, I'm not personally sure wanting that particular kit was the best evidence, but there you go). We probably would have bought the stock recorder ourselves, but not the crate. But we desperately needed another shed, and it was cheaper to pay 40% of the whole thing than 100% of the shed if we'd not got the grant. Not that we actually have yet, just a large short term bank loan.
The process for recording weights and anything else you'd want to are very straightforward.
I don't know where you are, but if you are anywhere near the Borders you'd be welcome to come and have a look. I think the best thing to do is to think exactly what you would want your new system to do, then ask those specific questions of the manufacturers.