As someone who went through the 'entrepreneur route', which is not what this start-up visa thingy is but it was a related program, it's still Canada and it is still the Canadian government, as well as Canadian immigration:

Canada is a great country, lots of really nice people and amazing scenery. Toronto, Vancouver, Calgary and Montreal (order of personal preference for running a business) all have sizeable tech scenes and all have a reasonably good access to the US market.

If you're Canadian you can very easily leverage your position into one that translates into most of the pros and very few of the cons of living on the North American continent.

If you're an outsider planning to move in things are substantially different. The first thing that you'll notice is that there is a sizeable industry that exists just to make money off new arrivals (aka immigration lawyers and associated services). There are a lot of gotchas that nobody informs you about (such as, for Ontario, applying for OHIP coverage immediately upon arrival, wait one day too long and you're in deep trouble), there a lot of silly rules and regulations that won't make sense to you if you're not from a country that qualifies as a 'nanny state' and there is a lot to be learned about banking and your 'credit score' if you are not Canadian and you do not have any history. Banks are really hard to get any reasonable performance out of, there are too few of them and their offerings are too uniform.

The Canadian government is saying 'A' but will actually do 'B', and it will do this at length. In my case, with a guaranteed landed immigrant status in the year 2002 it took until 2007 for me to finally give up on the whole process and move back to Europe.

By then I'd had enough of the Canadian authorities and the fact that there are only two seasons, winter and construction. If the government had kept their promises of speedy processing for me and my dependants I'd be singing 'Oh Canada' right now and I would have taken the snow into the bargain. As it was, losing half a year per year to the elements (the first two years were spent in Toronto, the last 3 on an island near Sault ste. Marie), having to deal with uncertainty from the governments side, a dog-eat-dog attitude when it comes to making money with people (which turns into making money off each other if you're not very careful), a school that was outwardly secular but internally dominated by religion and many more issues I'm reasonably happy to be back in Europe.

There is lots of stuff wrong here but at least my status here is not questioned with every move I make.

Fun fact: two weeks after shutting down the Canadian company, firing everybody and moving back they came through with the paperwork and asked if we would please come back...

Take home lesson: Beware of promises by the Canadian government, especially when it comes to giving landed immigrant status to foreigners (forget about citizenship, that's a different kettle of fish), even ones that bring tons of business with them. The best I ever got out of them was a work permit for me, but not for my spouse. Be prepared to be kept waiting (quite possibly for a great many years), and be prepared to file ever more paperwork at great expense and expect the game to change while you're playing it. Great Eh? ;)