I purchased my 202 last year and had the same questions. I knew I wanted a panoramic swing lens camera but wasn't sure what to look for.
Here is my experience/thoughts.
The handle, while sometimes useful for holding the camera steady and holding the filters, is unnecessary. I used it once and have never needed to use it again.
Filters, never touched them. Way too hard to put into place and way too easy to lose. I never needed them either anyway.
Leaks, I don't know if that is really a concern. The way the film runs through the camera and how the back fits, leaks are really not an issue in back (that I've experienced). Banding is more of an issue based on how smoothly your shutter system works. What you do need to look for is one that works smoothly, consistently and does not eat your film. And sadly, those are things you only figure out when you get one.
Make sure the viewsight is clean and clear. It doesn't have to be perfect like any viewfinder, just working. Also make sure the bubble level works. It makes taking nice even shots much much simpler. You'll find you ignore it most of the time but there are times when it comes in handy. I think I shoot my 202 from the hip, gripping it on the outside edges and using the bubble on top to site in my shots quite often.
I suggest you don't pay over $200 USD for one, a nice clean working 202 can be had for $150-175 USD on eBay. (Not sure what the conversion is to CAD.)
Things to consider... The film path on these is aggressive. You have 2 places to run film under, one big hump over, and it has very strong ratchet sprockets that can easily rip films. So, when you do get one, try to avoid expensive, rare films and anything with a thin base until you get the hang of it.
Make a note of what film is in it and how many shots you should get. When you get near the end of the roll, advance each frame very carefully. If it resists even a tiny bit, stop and be done with it and rewind the roll. Probably 75% of my rips are from end of roll issues where the strong ratcheting system pulls the film across the sprocket wheels and tears it.
If you hand roll your film and you know you will be using that roll(s) for the 202, make sure to tape the ends extra well to the spool so the film advance does not pull it lose. I use painters tape (the blue stuff) and tape it so it's not coming off without my help. And since hand rolled is a little more iffy as far as when you reach the end, just be careful. Like I said that film advance ratcheting system eats film left and right.
When rewinding, sometimes, especially if there's pressure from a partial frame advance, the "Rewind" release button can be a bit difficult to press in. I keep a small tool in my bag that gives me a little extra umpf to press it in case I'm mid-advance when I hit the end. Remember as I said above, if you force the film advance, you will most likely tear the film.
I know my post covered use tips as well as shopping tips but I hope they help.
