I've been giving this a great deal of thought.
Let me first say that I LOVE Ron's products. See a need, fill a need.
On my 2010 RT, the RonBar was ESSENTIAL. No question. And his spark plug/wire kit was also a requirement. I recommend that kit for every Spyder with a 998 cc engine.
On my 2014, straight out of the box, the suspension handled better than the 2010 with the upgrades. Nevertheless, when riding two up, I felt the need for an improvement and wasn't disappointed by getting the RonBar.
So far on my 2020, my seat of the pants assessment using my highly calibrated a$$

is telling me the stock set up is quite good. I'm not detecting any issues around turns.
Now admittedly, I've only got about 800 miles on the new bike. About half of that has been two up. Because I was breaking in the engine, most of it was on back roads, some quite twisty. Not many miles on a windy highway yet, but I've comfortably passed 18 wheel trucks.
Can a stiffer sway bar make the suspension better ? I'm sure there is room for improvement. But how much improvement ? There is, after all the law of diminishing returns.
Is BajaRon's bar in fact stiffer than the 2020 "heavy duty" OEM sway bar? The jury is still out on that. Some deflection data of Ron's bar vs the stock BRP bar would be helpful.
As all manufacturers do, BRP sees popular aftermarket accessories and then includes them into their own OEM line when they redesign their units.
We all have a tendency to justify our actions, so OF COURSE those who compare the performance before and after the bar upgrade can see an immediate improvement. And remember the OP is trying to SELL new sway bars.
I'm guilty of the same thing. I never even bothered to try the bike with the STANDARD handlebars, and naturally, the u-fit long reach bars wouldn't be good enough either, so I HAD to drop $600 on the HeliBars.

pps:
I'm not ruling it out, but for now I'll sit tight with the stock setup for a few more thousand miles. I'll check out the link set. I know those plastic links fail, and I'll concentrate on lighting up the fender and rear bag deflectors.
Now if only BRP would copy noboot's center power arm design for the windshield. Although one thing I've noticed is the 2020 windshield seems far tighter and doesn't rock side to side like my 2010 and 2014 did. Maybe they've fixed the center arm failures by supporting the windshield better.
Just my opinion, I could be wrong, and if I am it's a metaphysical certainty that HORDES of the forum posters here will let me know:yikes: