Ah, they've fixed the part I dislike about my PowerBlocks and have true 2.5lb increments. My older model is 5 / 2.5 / 2.5 lb increments which then repeats.
But if you constantly need to make 2.5 lb changes, the BowFlex option is quicker and more convenient, but bulkier (set it down, twist the dial, lift). For the PowerBlock, you have to set it down, remove the handle, remove or add the weight inside the handle, then put the handle back in.