I'm currently using rotopinks on my electric! 6.40 for one set and includes extra 1st string. My current set is 3+weeks old already and the strings are still shiny. Haha doesnt rust leh. All i did was wipe after play.
The ernie ball slinkies rust so damn fast. But the thing is that they are very slinky to me. haha easy to bend and stuff.
DR too ex la.... Its equal to buying 3 normal sets of strings. I remembered when i use DR, i scared to spoil the coating. Hindered me while plucking and stuff. lol