Yamaha PSR-S710 keyboard - 61 touch-responsive keys, 1214 sounds, 232 styles, 128 note polyphonic, GM2/GS sound compatible, drawbar organ, one-touch settings, 5.7 B/W display (displays lyrics & notes)...
AdvantagesCompact, portable, very powerful, excellent quality of features and sound, simpler than 540.
DisadvantagesNo longer made, replaced by E300 and 400 series now.
AdvantagesA tremendous instrument for the musically minded
AdvantagesCompact-ish, light to carry, a few great features, good touch sensitivity, versatile.
DisadvantagesTinny external sound quality, not many new styles offered, some surprising omissions, build, price