Scary sharp starts getting expensive in the long run. Cheap to try out and not a bad option if you're not be in it for the long run.
The after market blades and chipbreakers aren't the best option IMO - been there done it, a few times. By the time you've paid for the Plane, the blade and the chipbreaker you may as well go out and by a new Stanley SW or Quangsheng. Both of those planes have very good blades and chipbreakers.
Derek. I once mounted an old tapered Sorby blade into a Stanley No.4. Really thick blade - I think it was 4 mm at the cutting end. I tried brazing the extension onto the stock chipbreaker and that worked for a few months before it came off. In the end I brazed an extended piece onto the yolk and that's been fine for the past 4 years or so. . . . but in the end it's a lot of work, especially if you value instrument building time. I mess around and try many different Planes because I like . . . messing around with Planes.
