Performance as promised, no more, no less.

First two benchmarks:
Was tested directly to the USB port of my LG X110 netbook with H2Bench c't.
For reference, my Sandisk Extreme Ducati Edition 4GB serves.

1. Sandisk Extreme Ducati Edition 4GB (20Mbytes / s read, 20 MByte / s writing by the manufacturer):
- Continuous transfer rate read: 25481.3 means; Min 20948.8; Max 27577.5 [KByte / s]
- Continuous transfer rate letter: means 16427.9; Min 13565.8; Max 18388.3 [KByte / s]
- Application Profile 'swapping': 6090.5 Kbytes / s
- Application Profile 'Install': 4124.1 Kbytes / s
- Application Profile 'Word': 5745.5 Kbytes / s
- Application Profile 'Photoshop': 5612.0 Kbytes / s
- Application Profile 'Copy': 15929.3 Kbytes / s
- Application Profile 'F-Prot': 5828.0 Kbytes / s

2. Delock Nano 8GB (19MBytes / s read, 5MByte / s writing by the manufacturer):
- Continuous transfer rate read: 17091.8 means; Min 14457.3; Max 17532.1 [KByte / s]
- Continuous transfer rate letter: means 5494.0; Min 4269.5; Max 5712.8 [KByte / s]
- Application Profile 'swapping': 2491.7 Kbytes / s
- Application Profile 'Install': 1341.3 Kbytes / s
- Application Profile 'Word': 1874.0 Kbytes / s
- Application Profile 'Photoshop': 2172.0 Kbytes / s
- Application Profile 'Copy' 5313.4 KByte / s
- Application Profile 'F-Prot': 2480.7 Kbytes / s

Rating:
From the results can be read clearly, the manufacturer's instructions are in both cases, quite close to the values ​​reported. During the Middle Sandisk letter with about 3,500.0 KByte / s lagging behind the manufacturer's instructions, the Delock doing something difficult with approximately 2,000.0 KByte / s minus reading.

The manufacturer's instructions are usually based on "the achievable under optimum conditions".
That reality is often far away from the results of "application profiles" which simulate typical read / write access to the disk. Thus, the data rates expected to break a dramatically when simultaneously held read / write access.

Apart from the main stand itself but also affect a number of other factors, the transfer rates. When writing an example. 8GB large file is nearly achieved a high probability of the specified transfer rate, while 800 individual files need a total of 8GB considerably longer. Furthermore, USB hubs and extensions have a negative effect on the transfer rate. So came attached to an active hub (installed in a Dell monitor) only adds to more than half of the previously reached value of Sandisk.

Conclusion:
Performance as promised, no more, no less.
The criticism, in particular on the speed is not justified. The cause of unfulfilled expectations is simply the lack of technical knowledge and the specific conditions under which the stick (Delock and Sandisk at the same rate) is used.

For the sake of completeness:
After about two years of use the car radio the stick is now broken and is recognized more in any device.