Well, are the pad shells hammered metal (Pro series), or sort of teardrop-shaped molded plastic with an octagonal back (Acupad)? The Pro series look more like a regular drum, whereas the Acupad celebrates its non-drumness... I'll bet they are the latter, and then the question becomes whether they are single or dual-zone.
Have a look at
http://www.hartdynamics.com/products.html to see examples of the pad types.
Are the heads black mesh or white mesh?
And are the cymbals bronze metal, gold plated cymbal-shaped plastic, black cymbal-shaped plastic, or somewhat triangular futuristic black plastic?
Lastly, are the rack clamps plastic or metal?
If you look at the old picture of my Hart kit from
http://www.drummerworld.com/forums/showpost.php?p=1028517&postcount=4 , you'll see what is now a 15-year-old kit roughly equivalent to the current Giga Pro: old black mesh-headed Acupad toms and kick, newer white mesh-headed Pro series snare (upgraded later), all metal rack clamps, and the relatively ancient Ecymbal X "futuristic" cymbal pads. IMHO, those cymbal pads are somewhat dated, but still function marginally better than the black plastic and gold plated plastic Hart cymbal-shaped triggers that followed them.
The most recent bronze cymbal triggers are arguably the best of the lot, at least in my opinion, but they did bring a premium in price.
I bought this kit back when the mesh heads were still fairly new- prior to that the Acupad kits came with regular drum heads. I haven't had to change heads on the toms since I changed when they came out with the dual layer black mesh. Those heads in the picture (about 4 years old now) are still there today, going strong.
If it has an Alesis module, it is probably the DM5, but it might be the DM Pro.
If you played them in the past, maybe some of these details stuck with you. Does any of this ring any bells? So $600 CDN might be a reasonable price, but you really need to know details of what you are getting to do that analysis. As an example, there is a minimalist 6 or 7-year-old Hart/Alesis Acupad kit with an Alesis DM Pro module and a few Ecymbal X cymbal triggers on Ebay right now with a $399US buy-it-now...
http://www.ebay.com/itm/Alesis-dm-p...ultDomain_0&hash=item484671be54#ht_846wt_1343
In any case, mesh heads are arguably a huge improvement over rubber. And I believe that Hart makes a very strong and reliable product. I came to them after killing a lot of the early Roland rubber hardware, and have stayed with them all this time, for whatever that is worth.