I certainly don't disagree with Arnie. I haven't used Syren blocks yet, but they look beautiful. And I agree about the alternative deadeye options. You don't need a block shaper.
I am, however, a little bothered by the thought of people investing several hundred dollars in a project that, statistically, is highly unlikely to be finished. I'm not trying to discourage people from getting into the hobby. But buying hundreds of dollars' worth of fittings while you've just started the hull doesn't make much sense.
My approach - the approach of a reasonably experienced amateur modeler with a strictly limited bank account - is to buy fittings as I need them. I buy three or four dozen, and when I start to run low, I buy a few dozen more. My little scratch-built frigate Hancock has close to a thousand Bluejacket blocks and deadeyes in it, but I didn't send BJ more than ten dollars at a time. (Admittedly the little buggers cost less then- thirty years ago.)
I'm not sure I could afford to buy a complete set of blocks and deadeyes for a full-rigged ship (I.e., a vessel with at least three masts, all square-rigged). I've known beginners to announce that they're going to rig all the gun tackles and all the running rigging of the Heller Victory. The total number of blocks in a model like that would be well over a thousand. (Think about it. Three tackles, each containing two blocks, for each of 104 guns. Throw in two more blocks for each of the 90 or so port lid tackles. We're close to a thousand already - and the masts haven't even been set up yet. No sane person who knows what he's doing would rig all those invisible tackles. But I've known people to buy all those blocks - at several dollars per dozen.) None of those acquaintances has come even remotely close to finishing his/her model. Seems to me like an awfully expensive lesson.
Bottom line: to each his/her own. But in model building, as in virtually every other realm, it's not a bad idea to seek out a few voices of experience. As Arnie said, that's one reason why forums like this exist. And I certainly hope none of my posts is seen as negative feedback.
I hope I may be forgiven a personal note. I was sent a Heller Victory when it was brand new, to review for a magazine. I gave it away a few years later, rather than move it to a new apartment. I love the subject of the Napoleonic Wars, and that ship in particular. But the Heller Victory isn't on my to-do list. At the age of 63, with maddeningly deteriorating eyesight, I want to finish more than one more sailing ship model in this lifetime.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.