I have a DSL40c from 2016.... I replaced the original speaker with a Celestion Vintage 30. I really like the way it sounds. The crunchy channel is diverse and I use it for clean tones (volume on guitar rolled off) as well as low-gain crunchy goodness (guitar volume full open). The high gain channel is good as well and meets a variety of needs. The amp takes pedals well in the front as well as the FX loop. The reverb on it is fine for just adding a little depth to the sound. I always have a delay pedal running too.
I have tried a variety of distortion pedals through this amp and have determined that the best distortion available is the amps natural distortion

. To play it at home, I just use my volume pedal in the FX loop to lower the overall volume while still maintaining sustain and saturation for the most part.
This amp is very good for recording and playing with a band. I would not recommend the 40watt version for just regular bedroom practice.. it is too loud unless you follow my suggestion above.
I can't speak for the newest version of these amps.
A head version of this amp is probably better to move around for rehearsals and gigging.... but to each their own.