LASER QUERY. To reach to that level?

I will undergo LASIK after 2 weeks from now. Doctor will perform LASIK on Alcon Femtosecond Laser LASIK ( Model : FS 200). I want to know that is this Laser best in the market or better than that is available?. What is excimer Laser then? What is the difference between EX 500 and FS 200?. Is this Alcon FS 200 Femtosecond LASIK BLADELESS? Doctor said as I have a cylindrical power of -2.75 D, I may not have the desired result ( 10% chances). Best Laser correction is achieved if only spherical power exists. What is the issue! My BCVA is 6/9, doctor said. Will I be able to see 6/9 immediately after surgery or will it take time to reach to that level ? I have asked too many questions, please answer in detail one by one. Detailed answers are requested. Thanks