I have owned a stable of Shens, and have several students with them, and have had high schools and universities buy them. They are like all wooden things in a production/manufacturing setting....they vary.
My personal basses have been an SB 190 flatback,, a Willow flatback, a 180 round back, and my current bass, a 150 flatback. My affinity for flats comes from my first great jazz bass, a restored carved Czech flatback. Maaaan, do I miss that bass!!
I have had junior high programs purchase 88s and 100s, high schools and a community college get 180s, and 2 universities with a couple of 190s and fully carved maple round backs. All very good, some excellent and a couple of Golden Tickets in there! All set up by BVS, Nick Lloyd, Jon Peterson, Joey Nager (who I'm buying lunch for tomorrow! String change and setup tweak Sunday!).
The willow was not a huge sounding bass, but sounded great arco.
The 190 was a gas, but it is a BIG bass! I had it while I was living in Suzhou taking a train all the time. Great sound, and sold it when I moved back home.
The 180 was a bass I bought while I had a full top-off restoration of my nice German bass. Played it a year and sold it to a student. A HUGE sounding bass for a hybrid!
Current 150 flatback is a love/hate relationship! Finicky little bugger, but when the post is happy and the weather is good here, it's the best sounding bass of all the Shens I've had. It has a set of 3885s on there now, but Joey is putting a set of Zyex lights on for me. So, so even, and projects really well!
My bass has tried Weichs, 42s, and these 3885s. It seems happier with less tension on the top, plus I just had carpal tunnel and ulnar nerve surgery 8 days ago, and Daddy gotta lighten up, or else!! I was also a snare drummer in DCI in the Cadets, marched 11 years, and beat the pi** out of Kevlar batter heads for the last 3 years as a player. Getting old is a drag, kids....
Hoping these Zyex are the ticket....unless someone has an unopened set of Velvet Blues they'd like to donate to science...
If you like a larger bass and can locate a 190 (not made anymore, afaik), get it and play the daylights out of it!
If you like a rounder tone, get a 180.
If you play in an Arco setting primarily, consider the Willow.
If you like a very quick, forward but still warm and full, try the 150 flatback, but I don't think those are being made right now, either? If I am wrong, I will be very happy to be so...please correct me.
Of course, there's basses made by Upton, Eastman, Christopher etc. Follow your ears....and it's very ok to have one or more basses, right? Now if anyone has my old Czech flatback, repaired by David Millard in San Diego, I have a spare kidney and a BMW with the title waiting...