Do you need the extra? Probably not, that's something only you can decide.
So here's the thing. I was very undecided when I did the change and it took me several years to decide. I have a reasonable understanding of what is right/wrong as I work in a M/C workshop most Thursdays and am often involved with the fiddly adjustment stuff rather than heavy work. And before the R3 a fair few of my bikes have had adjustable suspension or have been modified.
As Scott knows, there is a guy called Blaine who is a suspension expert and he fitted (Ducati iirc) innards into his forks. My epiphany came when I visited DMX suspension (which is just down the road from me).
I asked what they could do for me and they said nothing, but asked if I knew what was "wrong" - The boss took the R3 for a short ride and said - "The forks innards are shyte". Springs are too soft and the damping is poor. He mentioned heavy oil but implied it would improve one bit but make the other harsher. Sorry I ca't remember which way round.
We both looked high and low for some used innards on ebay etc - and after a year I contacted Richard at Maxton as they worked out cheaper. When DMX fitted the Maxtons for me - replacing all seals etc (btw there is a HEAVY DUTY seal from Ohlins that is a direct fit and better/cheaper than the Kayaba original) - they took one look at the now removed Triumph "dampers" and started to shake their heads.
You don't have to use Maxtons - but I would strongly suggest going to ANYBODY who builds suspension to order and talking to them. And fit good dampers. R3's are heavy and have fairly heavy unsprung weight values too. This requires a different approach. Any decent suspension place will understand. 1/2 tun on the rebound damping adjusters made a huge difference (10-15 kmh faster in bends) - Do you NEED it? - maybe not, but once you have it - You will not want to be without it.
I already had Fournales rears on or I might well have ordered a matched set from Maxton.
Personally I'd rather spend the money to fully use the power there is than add more and "flubble" around bends.