I have installed the Ultra Plus (256GB model) in my old Toshiba Satego X200 Notebook with Intel Southbridge ICH8M-E. The performance of the SSD is super, and the notebook got a tidy boost. There's just one problem: If I make a cold start, the SSD is not recognized and the HDD LED lights. Then I have to press Alt + Ctrl + Del, the Bios reboots and your hard drive is detected. In Windows it then runs totally reliably. My guess almost, that this was also the problem of the 3 negative reviews here on Amazon. Because sometimes the plate is detected in cold start. If then at the 2nd start is nothing more at once, it is meant that the board is faulty.
Edit: The problem could be fixed with a firmware update to version 2316RL. Now everything is running like butter!