Very high smiles per gallon.

Low cost to buy, operate, repair, insure.

Fun ride in town and shorter trips.  Not the best choice for a cross country cruise.

Ditto on the other two comments. Cost and ease of maintaining and pretty reliable.

Price, reliability, lots of power for its weight, great support at this site, easy & inexpensive to repair. It's also easy on gas. I like Harleys too, but why spend money you don't need to. This bike is fun to ride, and will do what you ask of it. Go to a Harley Dealer and compare parts prices and the S40 looks even better.

That single cylinder means it's lightweight for easy maneuvering and control at low speeds.  It means you'll get great fuel economy.  This bike has lots of usable torque whether you're scooting around town or cranking the throttle on the highway.  Low-maintenance belt drive and low cost to buy and insure.  Great looks, unique characteristics.

Cost....  maintainence is easy so that saves money,  Least stolen bike in America and one of the top three least crashed, so insurance is cheap,  Bike has been almost unchanged for 23 years so used relacement parts are easily had.

Light weight , ... means, at approx 30  HP, it has a horsepower to weight ratio that will make you smile.  Means in the twisties it will walk away from the stock bigger Harleys (But not a Dyna Wide Glide or Sporster 1200.... those are the hotties).  It is not a sport bike so you won't keep up with them.

Bike has been almost unchanged for 23 years....... think about that.....  You can count on your hands (without resorting to using your toes) the number of bikes that are as long in production unchanged.   Yea, there are some flaws, but ....23 years..... the flaws aren't that bad...... Suzuki would have discontinued it if they were.

You would be hard pressed to find a better all around bike for the $$.  There are other good bikes out there for sure, but not at this price.
I had a sportster last year and it was a very nice running bike but I found that I did not like the added weight ... nearly 2x as much ... and with no power advantage and a distinct handling disadvantage.  I much prefer the lighter weight and power characteristics of the single.
Everybody has their preferences; colors, shapes, sizes, looks, power, the FEEL OF THE BIKE, etc, just depends on what you want.
Every bike has + & -

The road rockets are faster than you really want to go, and 98% of the time how fast do you really drive when going from here to there ?  Do you really want to be hunched over all the time like that ?
The V-twin road cruisers start at nearly twice the weight of a Savage/S40 and are comfortable to go down the highway in a straight line but what about the fun of a mountain road ?  They cannot turn very tight without scraping metal-to-road and it is not easy trying to swing all that weight back and forth.

So reall be honest with yourself and think about the riding you will be doing that 98% of the time you are out on the bike.  Going to work ?  errands ?  just for fun ride ?  what are the roads like where you will ride ?  speed limits ?  road or weather limits ?  
When you go over all of that in your mind it will show you the TYPE of bike you need for yourself.  That should narrow it down for you to 2 or 3 bikes...or maybe just this one.

The folks who ride this bike range from "never before been on a bike"  to many of us who have been riding for  20, 30 or 40 years and have thrown a leg over just everything in the biking world, but here we are having a great time with this single.  

My whole family rides bikes. Harley's mostly. My 01 Savage still ends up the topic of conversation. The design of the Savage is what Harley USE to be, simple, close to bare bones (or you can make it that way) and inexpensive to operate. Plus you can make it quite a looker. I'll put it this way. When I pull up in a group of riders most people are looking at my Savage, not the 20 Sportsters around me.