I've had a lot of experience with the EAA Witness. They're reliable rugged guns with an important caveat: you have to be careful about the mags. On the used marked, some guns with rounded slides had cracking issues due to improper heat treatment, but the new ones and older pistols with rectangular slides don't have this issue.
The only magazines I trust in the pistols are made by Mec-Gar, these work great. The probem is, Mec-Gar doesn't manufacturer compact magazines for the Witness, which has caused a lot of headaches for quite a few owners. Don't buy the compact, consistently reliable mags just aren't available, some compact mags work, but many don't.
For those of the us in the USA, it's no big deal. Stick to a fullsize Witness and use Mec-Gar mags or K10 marked magazines in 10mm and you're good to go. You can easily identify the new magazines by looking at the markings on the mag body. You should see a "K-" followed by the caliber, so "K-9", "K-10", "K-40", etc.
The probem is, you're in Canada, which may or may not mean mag restrictions, sorry, I don't know your laws. In any case, if the only magazines available in your area are 10 round with red followers, then stay away from the Witness. If, however, you are allowed to permanently modify a Mec-Gar mag, or, if 10 round K-series mags are available in your area, then you should be fine. I'd check with other local shooters and see if K series mags can be purchased...good luck calling the importer, though, they're likely to tell you all the mags work!
Edit: Looks like 10 round K-series mags ARE being made.
Here's one in .38 Super, but I see they have them I all calibers...
http://eaacorp.com/gun_accessories/...agazine/large-frame/one-ea38m10-101460-1.html
Here's a red follower compact mag. These are junk.
http://eaacorp.com/gun_accessories/...5-polymer-frame-model-2005-magz-101943-1.html