Wow people don't seem to have a grip on reality tonight. f/7.1, that's only good for a paper weight, a rebel user, ignorant new entrants customers, batting practice...... seriously folks, need to go home if the clouds come out!? Talk to the people that have spent 3k to mount a 100-400 on a 1.4x and shoot at f/8, or a 2x at f/11. Lots of people shooting sports and wildlife with those combinations and quite happy with the results when a 10k option isn't an option - but they (me) must be ignorant for being happy with these results.
If the price is right, the lens small, and image quality decent, this lens will make a lot of people happy.