Personally I skipped putting in solenoids once I got my SSF settings dialed in. But I have a somewhat unusual setup, but I expect even more normal ones using SSF Thump probably give a similar result. I find it more than sufficient and has the added advantage of being able to control the volume. That said I do plan to add solenoids, just to see, at some point. But at the rate I work on the hardware (going on 5 years) I don't expect it to happen soon.
If you do get solenoids, SSF is still desireable for other sound effects. Most people will consider the solenoids a must in a cabinet.