injector question

i found these accel injectors on sale at summit for like 200ish for a set of 6, this is an incredible deal, since even the remanufactured stock injectors are like 80-100 dollars a piece. better yet the price is the same for the 15, 17, 19, or 21 pounders. so my questions are

- anybody heard any bad things about these injectors?
- what size should i go with?

never heard of them but then again i havent had to buy any lately but also "you get what you pay for!"