Too cheap! Tube amps require expensive parts. If the actual cost to manufacture these after profits and shipping is $20, then what's inside those transformer cans? SS is king of value for commercial amplifiers under $1000.
As for the power rating 4.5W can make 85dB sensitive speaker with flat 8ohm impedance play to 91dB peak with zero headroom and max rated distortion, on a small Chinese tube amp built for price and appearance that's 3-5%. Do you think that 5% distortion and no dynamic headroom will give you chills up your spine?
If you really want tubes on a budget, why not build your own? Something with known good design, using standard parts and common tubes that you can enjoy rolling, and with enough power to "almost" do the job ("almost" just like all tube amps.)
http://www.tubelab.com/SimpleSE.htm I know a few people who have built this and are happy with it.