This is third generation of this A/C unit I have had. First one lasted 8+yrs; second 5yrs (but was hit freezing rain when hot; if not I expect it would have lasted longer).

Unit requires two persons to install. Should come with chucks to support the back; I cut 2x4s to angle of outside sill, and fabricated an inside sill rest the width of window for extra support. 

Packing from factory excellent, except for wings which are in a too small box and thus arrived with broken guides for expanding panels. Manufacturer promptly replaced these. 

As with most window A/C units the front cover is a snap fit and presents a bit of a challenge to remove. But, this is mitigated by the efficiency and reliability of the unit overall.