is that bad? better preformance for the same price?
It could be bad. SSD firmware updates downloadable from company sites are free, usually fixed certain issues, and sometimes even provided a performance boost. Now, imagine if instead of doing that, the companies just released the same SSD (only updated the firmware), but called it a newer generation model, but your "previous" generation SSD isn't allowed to have that firmware update, even though if you were able to get your hands on the firmware update, it would essentially become the next generation model. It would be like if NVIDIA releasing a GTX 980, stopped giving out driver updates past 347.52, released a GTX 1080 (which is exactly the same as a GTX 980), but you get driver updates past 347.52, which increases performance by 10% - 15%? Basically, we would have to pay for driver and firmware updates.
For me, I don't mind them advertising a product without giving it a proper review, since I don't buy any products without first reading official and consumer reviews for it, first. I just think it's bad practice. Again, it would be like NVIDIA releasing a GTX 1080, marketing it as being twice as fast as the previous generation GTX 680, but it actually performing less than a GTX 970 and costing around $550.