And how much does it cost to buy the synthesizer version these days? Are they hard to get hold of.
They weigh a little over 100 lbs.
The synthesizer version runs anywhere from $200 for a basketcase to $1800 for a complete package with legs and polypedal. Pretty wide variance.
Early Polymoogs are very unreliable beasts and it is hard to find a tech who can repair them. Serial #3900 and higher have all the upgrades and are much sturdier instruments. I have Polymoog Synth serial #4302 which has endured many gigs since 1985, and it’s still in great shape.
They’re not hard to find, just watch the serial numbers.
So, I suppose they weigh a lot more than my Voyager then. 
I am on the lookout for a decent Polymoog, and I will also watch out for those serial numbers. 
Save yourself a LOT of trouble and get yourself an Opus 3. I sort of sense that it’ll provide what you require (i.e. ability to play chords and made by Moog).
That’s no problem, I’ll buy both!
Soon, my bedroom will be full of synths!
You might want to look at a Memorymoog . While they can be problematic, they sound fantastic. Lot’s of modulation routing, three osc per voice ( six note polyphony)…
Brian
I’ve been looking at a Memorymoog actually.
I don’t want a synth that’s going to break down every forthnight. 
That can happen with any of the older synths, some more than others, but any of them. If you have a Memory that has had the updates done to it, and you keep it in one place, they are fairly reliable . Unfortunately right now mine are in the “not working” at the moment condition .
Brian
I agree with the notion of getting an Opus 3. More reliable, more cost effective, offering the same types of sound generation as the Poly and - ///////\ - made by Moog.
I want to hear what the Opus-3 sounds like first. It seems to have less features than the Poly, in terms of the different string sounds that are available.