The kit is:
Red G77 and GR77b - a bass guitar in the 'classic' 80s style Roland adopted with the stabilser bar and effectively a JX8p synthesizer. The base unit is 110V but in good condition.
Silver G-707 with GR700 - lead guitar styled to match the G77, excellent guitar but a poor synth unit based on the JX3p. The base unit has slight cosmetic damage (small dent and a cracked post on the end cheek, glued but still 'broken'

, is UK voltage and works well.
Burgundy Metallic G-505 with EMG active humbucker in place of first single coil and GR300 analogue base unit (true analogue synth, no pitch to MIDI, tracks like a dream but very limited). 110v with a home-made adapter box.
Prices are £1,500, £900 and £900 respectively. All have cables, the lead guitars have copied manuals, all guitars have cases. Cables are all original Roland, 2 of them are 'new'.
As for 'why', consider it an attempt to actually understand what my father was doing with music whilst using the fact that I could trigger sustained pads to mask my appalling lack of ability, plus the 80s models look excellent. Given my total lack of hobbies or interests other than a consumer-esque interest in cars seemingly based purely on acquisition, the studio seems to have been a positive focus for my energies despite a total lack of time to record anything. I figure it's time to accept that I really will never do anything with any of it at all, and the whole purpose of life is to exist to work and then die.
More info here:
http://www.dmc12.demon.co.uk/music/. Amongst the dross you'll see an incredibly rare Allen & Heath Inpulse One drum machine in fully working order - possibly the only one left, though I still have no sample tapes for it.