Beyond sucks would just about sum it up. 1800 dpi is not good enough.
It is slow. It is not color accurate. It is only sometimes in focus,
and NEVER iwth mounted slides. Anything else you want? Oh yes, it does
not have digital ice or any color correction software, and the software
it DOES have is minimal. Yes, beyond sucks is the operative term for
this dog. I have one and never use it anymore.

I have the Prime PF 3650 Pro3, which is a 3600 dpi scanner with digital
ICE3, and the fact that your model does not have ICE3 is reason enough for
recommending against it.  When I turn off ICE3 in my scanner, the dust spots
and film scratches are too much to bear.

With all the bells and whistles turned on, my scans run about 5 minutes per
frame.  The really good thing about the 3650 is that it accepts full rolls
of film, rather than having to insert 5 or 6 frames at a time.  I just
insert the entire roll of film, set up the frames I want scanned (usually
all of them), and come back in 2 hours when the scans are all done.  You
cannot do that with the 1800i.

If you are looking at the 1800i because of price considerations, my advice
is to forget it, and go for the 3560, which can be had on Amazon at prices
between $335 and $390, depending upon which of their affiliates is selling
one.

There is also a new PrimeFilm model, whose model number does not come
immediately to mind, that is even faster, and is marketed as one that could
be used in a mini-lab.  It goes for about $550.00.

While I think that the Nikon models have a margin of superiority, I
purchased the PrimeFilm as what I felt was the best combination of price and
performance.  As I do not typically print beyond 8 x 10, the 3600 ppi
resolution is adequate for my purposes.  In fact, the original Kodak Photo
CD scanned at a resolution of 3072 x 2048, and it had a DMAX of something
like 2.5, versus the PrimeFilm 3650 optical resolution of 3600 x 3600 and
DMAX of 3.6.  So I would suggest that you at least have a look at the 3600
and forget the 1800i.