The blades are usually mostly rubber , but there are other parts around the window often are plastic . <| sep |> That would be a value based comparison , not a performance based comparison . Or perceptions could might not match reality . The 535 had a poorer performing GPU than the 620 . The 620 and the 800 were not only different hardware SOC vs SOC but OSes . Windows Phone 7 . 5 was built upon prior Windows CE , Pocket , and Phone editions . Windows 8 was a groundup development on ARM devices . A better comparison would be a Lumia 550 , 650 , 950 or any other Windows phone to something comparable available on the market today . In hindsight , should you have upgraded from a Lumia 800 to a Lumia 620 , that depends on what your needs were . Should you then have upgraded to a 535 ? Maybe . Those were value decisions that you made at the time based off of whatever motivated you to purchase those devices . Did you just believe because the 620 was newer that it performed better ? Or did you upgrade from the 800 to the 620 because you wanted Windows Phone 8 , and the promise of a new generation of OS and phones ? What was your motivation for purchasing the 535 ? Did you purchase the 1 GB RAM or 512 GB RAM phone ? If the latter , what motivated that purchase compared to the 1 GB one ? Why would you downgrade your hardware level ? Why didn ' t you purchase the Lumia 640 instead ? Based on what I know right now , purchasing a Lumia 950 is a gamble as to whether or not you have a good experience or bad one . Regardless , there are now better choices with much better experiences despite the same OS available in the HP and Alcatel . Those same phones compare favorably in many respects to their counterparts using Android or from Apple .