Final Thoughts (copied from site) :

(+) Display and battery replacements remain a priority in the new iPhones' design.

(+) Most other important components are modular and easy to access or replace.

(-) Liberal use of screws is preferable to glue—but you'll have to keep them all organized, and bring out your special drivers (pentalobe, tri-point, and standoff) in addition to the standard Phillips.

(-) Increased waterproofing measures complicate some repairs, but make difficult water damage repairs less likely.

(×) Glass on front and back doubles the likelihood of drop damage—and if the back glass breaks, you'll be removing every component and replacing the entire chassis.