Sitka Spruce is the most well-rounded tone wood and is used on more guitar tops than any other wood. This is due to the tonal qualities and sonic projection of spruce. It has a nice even tone and does not accentuate any frequency above another in an overpowering way. Spruce also has a strong attack and does not get muddy at high volumes. This makes it a very versatile wood and makes those players with soft touches sound great and people playing with other instruments cut through the mix.
The auditorium body shape is probably the newest body shape for acoustic guitars. The auditorium takes elements that players love from various other shapes and combines them into a single body. The sound will be slightly different than a dreadnought and will scoop some of the mid range but it maintains the full dreadnought sound. It has a skinnier waist, much like a grand concert. This allows the guitar to rest lower on a player's thigh when sitting down and does not put as much strain on the shoulder. It's not hard to see why auditoriums have gained popularity so quickly.
I had two guitars before my Teton. A bad starter electric guitar (Ibanez Gio) and an OK acoustic guitar (Fender Sonoran). I was 13 for the electric and 14 for the acoustic. I had both of these guitars and played them semi-frequently for a few years. I was then in the market for 12-string when I was 17, as I was starting to get more serious about playing music. I found a decent Fender 12-string at a chain guitar shop for $199 that I was seriously considering buying at the time. That is until Chad at our local shop, Guitar Stop (which is where I had gotten my Fender Sonoran a few years before), had me play the Teton 12-string. Within minutes I had dropped every single thought of purchasing a Fender acoustic again. I ended up buying my STS105NT-12 after a few weeks of saving up and this company has changed my entire musical life since then. Nowhere else could I POSSIBLY find a guitar with such tone and personality for anywhere even close to the price of a Teton. It is almost the entire reason I take music as seriously as I do now, because being a teenager with little money does not constitute having a nice guitar. Within months, I ended up selling my Fender, Ibanez, and Fender amp all to buy more Teton guitars. I currently have the STS105NT-12, STS105NT, and TC003. The only other guitar I own is a Limited Edition TV Yellow Faded Gibson Les Paul (also from Guitar Stop). All of these guitars stand toe-to-toe with one another. I could not ask for a better guitar company than Teton. They have shown great customer service and respect for me as a customer over the last few years and I look forward to much more business with them in the near and distant future. I recommend anyone looking for an affordable guitar that can stand up to the best from big, name brand companies stop in to a local dealer and try out a Teton.