Andersen are very excellent quality windows. You will not go wrong with them.
They have a dealer on Dundas West who is quite good.The other name in the industry that is even better than Andersen is
Loewen.
In my opinion, Loewen is better than Andersen because Loewen are made in Canada (so their prices may now be cheaper than Andersen which are made in the USA). They manufacture in Steinbach Manitoba.
Both Loewen and Andersen windows feature wood core. Loewen uses Douglas fir while Andersen uses Southern Pine. DF is a superior species of wood for strength and cracking. Loewen also features extruded aluminum exteriors and have an incredible range of colours. (Andersen used to have just 3 plus some optional colours) Andersen is all vinyl exterior with a vinyl sash and wood interior trim. Loewen is superior because it is a wood window with extruded aluminum cladding on the exterior. Even the sash is wood in Loewen (with the extruded aluminum exterior). Wood is required for strength. Loewen is all wood on the interior which you can finish however you like. A real dumb dumb test is the weight of the window. You almost need a fork lift to lift a Loewen window they are built that strong.
Andersen has 3 different lines as far as I know, so you need to be aware of just which line they are quoting you. There is a huge difference in both quality and price. Again, Dundas Windows would be better able to advise you on the various lines Andersen has.
Loewen only has 1 line, but they can option them out differently, which adds to the cost.
I've used Loewen, Andersen, Pollard, Ridley, Pella and Geldwyn in my days.
For a house, my number one choice is Loewen, but Andersen is a very close second. Everything else is hugely substandard to Loewen and Andersen. In fact, other than Loewen and Andersen, the rest are pretty much junk.
I will also say that the Loewen dealer in Oakville is not the easiest guy to deal with, BUT, he will stand behind his product. He will honour his warranty.
Lastly, before you place the order, make sure you get them to generate the shop drawings for you. You need to review the shop drawings and specs from top to bottom to make sure you're getting what you need / want. This is hugely important.
If they are going into an existing house, make SURE to specify NO NAILING FLANGE (though with vinyl, you just cut this off)
Also specify Lo E and if you want to add grilles to the windows, etc. (I like the ones that feature grills only on the top quarter of the window (old school looking))