Readings with H2testw v1.4:
Transcend Extreme, 18,45:
30946 MB, writing: 15.7 MB / s, read 21.6 MB / s
Transcend Premium (300x), 16,90:
30626 MB, writing: 25.8 MB / s, read 75.7 MB / s
Transcend Ultimate (600x), 26.88:
30962 MB, writing: 36.4 MB / s, read 75.7 MB / s
HD Tune Pro 5.50, File Benchmark:
Transcend Extreme:
Sequential Read: 22980 KB / s
Sequential Write: 16420 KB / s
4KB Random Read single: 1154 IOPS
4KB Random Write Single: 2 IOPS
4KB Random MultiRead 1181 IOPS
4KB Random Write multi: 1 IOPS
Transcend Premium (300x):
Sequential Read: 89155 KB / s
Sequential Write: 32119 KB / s
4KB Random Read single 1741 IOPS
4KB Random Write Single: 218 IOPS
4KB Random MultiRead 1285 IOPS
4KB Random Write multi: 219 IOPS
Transcend Ultimate (600x):
Sequential Read: 89343 KB / s
Sequential Write: 47794 KB / s
4KB Random Read single: 2009 IOPS
4KB Random Write Single: 264 IOPS
4KB Random MultiRead 1457 IOPS
4KB Random Write multi: 270 IOPS
As UHS-I card they can play to their strength suitable hardware. The old non-UHS-I card is virtually without a chance in every respect and no competition.
The premium is indeed the Ultimate writing clearly inferior, but more than 30 MB / s for sequential write very well and reading there are only minimal differences. When processing small files the Ultimate is slightly better.
Due to the out zich Neten the moment value for the ratio premium is a strong buy recommendation (assuming that you use hardware that supports UHS-I. Otherwise, you can admire the excellent achievement probably not use).
Unlike other reviewers here I have no problems with Full HD video shooting with a Canon EOS SLR. But I have tested it with a 60D.