I love 'em. I'm happy to have saved money vs. the Akrapovic, loved the Termis on my 1098 so it was an easier choice for me knowing I love their sound.
Installation is more complicated than normal slip-ons, but manageable. The instructions are challenging at times, as is the language translation.
Loading the UpMap wasn't exactly the experience I'd like, the phone app and process is a bit cumbersome, again the bad translations probably attributed to the headache. Not horrible, just not great.
All in all, a few hours of work and you're rolling with some great sound. And they are "race only" so no cat...beware depending on where you live and your emissions regulations. Hate to have someone spend money just to not pass registration. Comes with the UpMap and the new air filter.
My dealership parts guy gave me a million excuses of why I should go Akra, and how I "CANNOT" install myself without seriously risking warranty voids (and even that I run great risk of melting plastics with even the slightest error). That and they didn't carry the Termis, they'd have to order it. All of this made my decision very easy...order Termis elsewhere and install myself!
No problems after several hundred miles with them on.