Wow, unusual post for a horse forum, but this is my totally based on my own personal experience your mileage may vary personal opinion:
Be very wary of programs that promise early reading, *particularly* programs that promote "sight reading" - learning to read by recognizing the sight and shape of words. Sight reading is a useful adjunct to other reading methods, but emphasizing it to the exclusion of phonics means you end up with a kid who can read but can't spell. Also, late readers tend to catch up developmentally to early readers fairly quickly - there's no real advantage to having your child read early. If the program is truly developmental, for example, teaches problem solving as well as pre-reading skills, go for it! If the program is about sight reading, *run away*, fast!!!! You'll feel great about your child's success until 2nd or 3rd grade, and after that you'll spend a lot of time working on spelling because your kid never completely learned phonics.
Again, just my personal opinion - your mileage may vary.