It depends on if you can sharpen one or not. I can sharpen saws, so I just can't bring myself to spend $175 and up on a backsaw. the picture in the link is one I got off ebay for 25 bucks plus whatever shipping was. I didn't spend much time restoring it.
It cut okay like it was, but was slow. The 2-1/4" long tenon in the picture took around 14 strokes (had a couple of hundred to do) like it came, and after I sharpened it, stroke count dropped to around 6.
Most of the new ones have some sort of gimmick to make them easy to start-not too sharp, smaller teeth on the end, less rake (which makes it cut slower). Chances are, if you can sharpen one, you can also start one okay, so the easy starting gimmicks aren't important.
Easy to start may be a good thing to start with, but it seems to me that it also may make it seem like you are dependent on it.
I have one that I bought new in the '70s, but the other 5 in the box came off of ebay, or out of junk stores. I wouldn't bother with one that is rusted enough to have pitting on the blade, a crook in it, or a handle that is too beat up.
Even though I had intentions of restoring the ones I've bought, I never got around to it. You can see in the picture that this one has paint splattered on it. Those usually go for less money.
http://www.historic-house-restoration.com/images/windows3_003.JPG
I was assuming this was about backsaws, but I have other opinions on regular handsaws too, which are a little different. I like Sandvik series 270 through 288 for those-best steel that you can get sharper and they stay sharp longer, even though I do have some others too.