Whether the SERG is "all it's supposed to be" depends on what one thinks it is supposed to be.

The new frame is definitely better and you'll have more confidence in turns, especially if you're riding aggressively. If you're coming off the SEUC you might miss some of its amenities, King tour pak, CB, XM, plush seat. So, think about how much you want those things on your bike. You can dress up the SERG but that gets $$$$. Don't they all? Some can't get used to the fixed fairing but the bike steers lighter and thus feels like it handles so much better. It is certainly a show stopping bike. People come up to me all the time to compliment the bike and color. $36K for a used one is high unless it has all those amenities (and maybe a Jims 131").
I've had more than my share of
2009 SERG Warranty Claims so you might want to read that thread and check each of the items on the bike you want to buy: Seat fit, ACR's, tire cupping would be the ones to look at closely. It will run hot until you change to better fluids and mod as discussed in the SERG boards. Here's my list but there are many:
SERG AND CVO: VERY GOOD TO ME! NEXT? These bikes are really just "starter kits." Half the fun is "modding on."
The argument over the
Best Color continues. In person, each color is beautiful! Nothing could be more subjective. As you can tell from reading above, (Disclaimer: No intent to offend anyone)
Jason's wheels have fallen off.
09S/E roadglide's idea of science is base on his dyslexia.
Crusty has fabulous pictures!

Terry (Hawg Sounds) has an outrageous bike but is color blind. (And can't keep up.)
nvwldthg is confused about women.
Klaus (Highjagger) is German. Seems like all German vehicles are Silver.
Big T's bike is beautiful and they all are but what's up with the reflectors?
TN knows the word to Rocky Top and thus might be a red neck.
aclass is a hypocrite
grip is full of Bunkie
FLSTFI Dave is.... I seem to have run out of wit.
Bottom line, not too many used ones out there!