I bought this to replace an Ultegra cassette that was worn out and giving me shifting problems. Works great, it's a cassette. Although slightly heavier than Ultegra, the lower price was worth it to me. From a practical standpoint, a few grams do not matter. I would rather save the money on the cassette and apply it to a better chain.
Lets face it, the 105 7000 series is above par of the later generation Ultegra items at a reduced cost. Not drilling down into the weeds on weight, but if you are looking for a products to last 10K miles and not a weight weenie than this little guy is for you. I am running this on my SMART TRAINER while the two bikes that get set on it are DA with one being DI (guess I am a weight weenie). That being said both my high end TT bike and road bike components fit fabulously on this cassette for my direct drive smart trainer. I plan on ordering another cassette for my TT training wheelset and know I will not be disappointed.
Shimano 105 range components are always a great value. This cassette works just as smoothly as the Ultegra cassette it replaced. I really like the 11-30 gear range. It is much more comfortable when climbing the 15% grade I have to go up to get home from every ride.
Such a dependable groupset. Happy to have this cassette 11-30 available to give me a little more gearing in the mountains. That's as big as I could go with with the short cage derailleur.