I have to believe that reviewing shaving materials has to be up there as one of the toughest to even make relevant for any other person. The number of variables are staggering between two different people let alone the entire male population of the world (or anyone else who needs to shave their face).
Off the top of my head you've got the following parameters:
I have to believe that the shaving companies spend a lot of time and money on large trials to determine what works best for the majority of face shavers through careful analysis and observation. It can't be simple and I'm sure there's some piece of either long-form journalism out there or a documentary detailing their processes.
So with that disclaimery stuff out of the way, let's get into my own very specific findings.
First of all, I don't shave every day. I shave probably every 3-4 days unless there's some big meeting at work and I want a clean shave 1 day after already shaving. So typically my beard is more than your usual 24 hour shadow.
Previously, I had been using the Gillette Fusion Power (GFP) razor without the battery-operated vibration. I probably got 3-4 shaves out of each razor, but that was before I started using a RazorPit blade "sharpener" ($20) that I found on Amazon which did prolong the use of the blades to maybe twice as long. HOWEVER, I have to wonder about the quality of the shave from those blades as I frequently cut myself shaving with them... especially when compared to the new Harry's blades (more on that in a second).
My shaving ritual is to shave after showering, splash on some warm water, splash on some shaving oil (for a long time I used commercial shaving oils, but recently switched to the much cheaper and just as good extra virgin olive oil from the kitchen which I recommend you at least try if you don't already use an oil), and then put some Kiehl's shaving cream on top of that. With the GFPs, I'd commonly cut myself on my throat (usually near my Adam's apple) and require the use of a styptic pen afterwards before applying some aftershave cream.
So I think that Harry's system is a balance between cost and a good shave. The first blade lasted 4 shaves for me (compared to those on Razorpedia that reported 7-8), but I felt the last one wasn't as good as the first three, so let's say it lasted 3 shaves. That was over two weeks time. As I said, my beard is probably of average thickness and hardness, and I don't shave every day, so maybe I put more wear and tear on the blades than if I shaved every day.
I will say that I hardly cut myself at all during those 4 shaves and no where nearly as bad as when I had used GFP blades. I attribute that to two things:
And finally, they are delivered right to your door per the shaving schedule you choose when you sign up. They come in the regular U.S. Mail, so there's no concern about being home to receive the package.
The one thing I do miss about the GFPs is the trimmer blade on the back of their razor head. It does such a good job of getting right under your nose and ensuring that your sideburns are straight that it is hard to beat, and unfortunately Harry's heads don't have anything like it. So I do keep an old GFP with my shaving stuff for that small bit of work, but I wouldn't discount the cost benefit and shaving quality of Harry's for it.
So in the end, I recommend giving Harry's a try. They sell a starter set with the Truman handle for only $15 (all their blades are the same; they sell two types of handle which both work with all of their blades: the Truman and Winston. The only difference between them is that the Winston is all aluminum and the Truman is basically plastic).