NO on the Canon. I had one of these scanners, in fact, an even "higher end" model, seems like it was the 8600F. Anyway, I ended up selling it due to the horrid scans it gave me of 120 medium format negatives. Keep in mind, the 120 negative is MUCH larger than your 35mm slides, so I can only imagine how much worse trying to scan anything smaller would be. The Canon is quite frankly, a low priced flatbed scanner with a light in the top so it CAN scan slides and negatives, but it is in no way designed from the ground up as a QUALITY film scanner.
The Nikon Coolscan 5000 has long been the accepted best for home 35mm scanning, however, it is very expensive, often times hard to get, and I have read that these scanners are being discontinued by Nikon and will no longer be supported once the supply runs out.
Shutterbug magazine consistently raves about the quality of the Plustek Opticfilm series of scanners. There are dedicated film / slide scanners and the results are supposed to be outstanding. (Unfortunately for me, they do not make one for 120 film, or I would have one myself). Here is the link to Plustek, and you can also Google the name to find sellers and reviews. I highly recommend you NOT to get a cheap flatbed such as that Canon if you want QUALITY scans of your slides.
http://www.plustek.com/product/7300.asp
steve