I ordered 10 of these mats to supply a new yoga class I'm teaching.
On the whole, they are perfectly reasonable mats for occasional use. They had a mild rubber smell, which wore off quickly. They provide a good degree of padding and reasonable slip resistance. Certainly doesn't compete with a higher end jade or manduka mat, but this is a great price point for something that doesn't have any big problems.
The extra length is a big bonus for taller practitioners and surprising to find at this price.
They provide a little more padding/springiness than I might recommend for an intermediate or advanced practitioner. If you practice frequently, it is probably worth splurging on something more specialized.
If you tend to sweat heavily and/or practice in a hot room, you'll probably need a towel or a practice rug to throw on top of it.