How useful is iESS mode for emacs?

(I reply to the Re: message because inadvertently I deleted the original)

My opinion is that using the ESS interface
for R is great for people who are used to emacs, and less
good for the rest of people, because  it is less intuitive
than other editors (i.e., WinEdit). For me it was
hard to get
used to the (many) idiosynchratic details of emacs (a minor example,
few people has a key labelled as META, but the M-... are
everywhere in emacs). Also, I don't like the fact
that if you, for example, make an ls() and then select
and copy an object with the mouse and paste, you don't paste
in the command line but on the list itself, unless you bring the
cursor to the command line first. Very
often I was
not in the R command line and used to get (and still get sometimes) a
message: "No command in this line".
Also, at least in my setup, the begin key brings you on top of the
">" instead of on top of the first character after ">".
Probably all these are minor problems (or perhaps, even advantages) for
people who use emacs also for other purposes.

Personally, I like better the Windows gui for R + WinEdit, 

although I prefer linux for other reasons. The facility for printing
and saving graphics from the graphic window is another very useful
feature that I miss in linux.