The A9 with 1 tip is around 110€, the RCD80 normally 180€, the nano 220€. For the price of the ersa station you can buy the a9 station and 3-5 original JBC-tips or many more of the china clones. But they offer most only 3 types standard and few sellers up to some 30 types. I have tested the K typ (JBC245-939) from 3 different cloners. The tips have the same performance, like the original. One type heat a little bit faster than the original, but the time from 6,5 to 6 seconds doesn't make a real difference. That are really stopped times, not from the ads. And the 2 seconds for the 210 and 115 tips are also real. Measured with an mechanical stopwatch.
Believe it or not, JBC offers some 1000 tips of the 245 range. The other much less. But some tips are nearly identical to others with a completely different number. Maybe one is for leaded and the other for unleaded tin. Because the tips are not in a noticable order, I think, each tip, that one customer want, get the next number. If you need a special tip, they make it for you.
The price of the tips, ok, I don't know the prices and sellers in Ireland. Here in germany the Ersa prices are 1/2 to 2/3 of the Price of an original JBC tip from a regular seller.
And the changing ot the JBC tips is much faster and without the danger of burning oneself.
The length from a 210 or 115 tip from the top of the finger to the top of the tip is 30 to 35mm, dependent from the sort of tip. That's shorter than the 48-50mm from Ersa.
Without doubt, ersa make good soldering irons, but I think the prices are to high, maybe the tips last longer as JBC, Weller, but I don't have changed the tip in my W-TCP more than 1 time, and that, because I need a smaller one, than the first, that came with the iron. That part works until now, but the handle is nearly broken and the time of nearly a minute to heat up isn't reasonable compared with todays tools.