Yamaha MX49 by Music Bird
Build: Great. It is built very solid, it has 49 keys from the C before middle C to 3 C's above middle C.
Sounds: Let me tell you, I love these sounds. There are a wide variety, like piano, EPs, organs, accordion, harmonica, electric and acoustic guitars, acoustic and electric and synth bass, acoustic and synth brass, strings, wind, synth sounds galore, like lead, pad, and comp (basically synth chords though one of the sounds is monophonic). Some sounds are arpeggios. I like the synth sounds a lot. The sounds all sound good.
No sequencer, but an arpeggiator, which I haven't dived into.
When I use it, I could use it with an iPad, or Cubase.
Weight: pretty light.