They are lovely, but as a tights destroyer, I will go with Falke, Trasparenze, Levante prices and enjoy the difference from M&S. But any more than that makes me so aggravated when they get pulled by boots/my handbag etc
Velvet Deluxe opaque tights definitely worth the money as they last for years and fit well, but I'd also hesitant about the more sheer tights as I have laddered many pairs on their first use (mainly the better M&S ones) when putting them on.
Yes, as already said velvet deluxe are lovely tights, same goes for satin opaque. They last for ages and are really comfy and look nice. I personally swear by neon 40. Again very hard wearing and comfy, and nice on the leg. I have heard it said that for look and for qiality they are the best tights you can ever buy. Twenties are also the best fishnets i have ever worn.