The harder the speaker is to drive the more distortion the amp (regardless of its technology) will make and be quite a lot more than the measured specs due to odd phase angles and the like. Even if you have a brute force solid state powerhouse its still important on this account to make sure the speaker is easier to drive if you want the most out of your amplifier dollar investment.
Yes, you'll hear something but it would not show off either in their best light on account of some basic design goal differences. Wilsons are designed to be driven by an amplifier that is capable of behaving as a Voltage source (IOW the amp can make constant Voltage WRT load impedance). SETs OTOH are more likely to try to make constant power WRT load impedance. Combining the two will thus result in a tonal inaccuracy. If the SET were to have enough feedback this problem could be overcome, but once you've linearized the amp in that fashion, the main reason for using one (its distortion signature) is gone.
The other thing about SETs is if they are not running feedback, they only have about 20-25% usable power before distortion starts causing them to sound 'dynamic' (this is due to the fact that higher ordered harmonics, used by the ear to sense sound pressure, start to show up on the leading edges of transients). Wilsons need a bit of power although their power needs are not extreme. You are thus far better off using a push-pull tube amp of good quality or a good solid state amp on them. The improvement in sound quality doing this over SETs on that speaker line will be instantly obvious to the most casual of observers.
