Planet13 - 9:13 am on Jan 18, 2012 (gmt 0)
Yes, if you WERE going to blast sites, then you WOULD want to use the method outlined by Crush above.
On the other hand...
You could try and come up with some unique, interesting content, find some people with popular sites (maybe they have lots of facebook fans or twitter followers, or blog readers), and tell THOSE people about your really cool content and hopefully they will pass that along to their followers / fans / readers.
Another variation on what Crush mentioned - but doing it in a more or less legitimate way - is to find sites that already naturally link to you (and hopefully not your competitors) and while you are out link begging different sites, suggest they link to that third-party site, too. Maybe if they DON'T link to YOUR site, then they will at least link to that third party site, which then links to yours.
(Neither SENuke or scrapebox will let you find other webmasters anonymously to buy links from them. They are more or less designed for finding blogs / forums where you can drop link spam in. When you have a blog and someone leaves a comment like: "That was a really well written article and I am looking forward to all the comments that people will certainly be leaving," and they have a usernmae like "cheap flights to destination XYZ", then you can thank SENuke / scrapebox for that link spam on your blog.)
I would google the words "senuke penalty" and see if there is much information about it. I think there is.
And finally, there seems to be a running debate (in THIS forum, anyway)as to whether spammy links really work or not. So, maybe that is why you are not getting a direct answer to whether to download SENuke or not.