Advise on 28-135mm IS

[paesyl]

Hi to all 'shi fu' who hand-on this lens,

Need to clarify about what the forum said about 28-135mm:

1) After prolong usage the lens zoom will have zoom creep problem like the zoom will slide when lens facing down or up

2) This lens tend to 'suck' in more dust compare to other lens.

3) Have jumpy zoom problem?

Thanks in advance.

 

[paesyl]

one more Q...why the review advise to switch off IS mode before mount on tripod?