A quick glance at the specifications reveals the Radeon R7 SSD lineup seems to be a slightly less performant version of the Vector 150 series from OCZ, the sequential read and write speeds are identical but the maximum IOPS figures are a bit lower. The 120GB model promises read speeds of up to 550MB/s and 470MB/s write speeds, the 240GB version has the same maximum read speed and a 530MB/s write speed and the 480GB edition is identical to the latter model. All three capacities have random 4k write performance of 90,000 IOPS.
US pricing is $99, $164 and $299, respectively, and in Europe it's around 90EUR, 148EUR and 237EUR incl. 21% VAT. Overall the Radeon R7 SSDs seem like a pretty poor deal compared to similar offerings from Samsung and Crucial. The only major difference is that AMD offers 4 years of warranty whereas most other models have a year less warranty.