i second this (disagree about synthesizer, but whatever).
initially bought my E2 to use as a drum machine.
it has 16 tracks with individual pattern length; per-track filter, modulation, insert effect and additional overdrive; very nice selection of drum sounds, gate arpeggiator for playing rolls, and other cool stuff.
and it has proper stereo output (unlike Volcas that even don’t have line out).
PS. regarding synth — is not so weak as it seems, and classic filters emulations in E2 (borrowed from King Korg) are superb.
but yes, overall synth architecture is limited, so it works well for only certain types of sound.
PPS. nothing of my gear does pitch modulated 808 kick easier and better than E2.