nwills,
I have an 2011 model with 1000 miles with a Taylormade, no db killer installed, 109 db on the street, she is loud, gutteral and nasty above 7K rpm, rode a neighbors with 8000 miles 2010 model, bone stock. His bike vibrates more, not as much midrange, and wheelies easier (due to softer stock suspension settings) than mine, I have full Ohlins suspension. You have to accelerate pretty hard to get the front wheel off the gound, which is good to have if you are doing track days with the bike. I use no power commander, and so far, no issues, we will see after a track day next week, running lean at high rpms is never good for valves, etc...
My theory about the vibration is that the stock system has two baffle chambers to quench exhaust pulses, whereas the Taylor is a free flow system (very little backpressure), which accounts for the extra vibration. It may be that fact combined the with 8000 miles on the motor that could be causing the extra vibration on the stock bike.
I like the Taylor. The popping you describe will self adjust through the ECU in the first 50 miles or so. I have a speed shifter, and that will pop regardless whether you run a Taylor or stock exhaust. I like the look, weight savings, 15 lbs lighter than stock, I have seen them advertised for as little as 1295 $ I paid 1500$ for mine. Here are some pics of my bike:
One of... a work in progress
If riding for any amount of time with a Taylor and no DB killer I would recommend earplugs. Iif you venture into regions above 10 grand on the street be aware that local law enforcement will hear you coming (about 1/4 to 1/2 mile) before they see you. The sound between 10 - 14K rpm's will make the hair on the back of your neck stand. The closest thing I can compare it to is a Formula 1 car under hard acceleration.
My bike has recessed front and as of today rear turn signals, CRG bar end mirrors and the Taylor exhaust, making for one sleek package. I like that look.
Wind buffeting at speed is better with bar end mirrors than stock, less turbulance, and I have a double HB windscreen to help a bit more.
Good luck with your choice. If you like the characteristics I described, then the system is for you. I have been looking for uTube video's for Taylor track video's and so far have found none. Please post any you find.
Rhody...