I had an Eros II and I thought it was a pretty fun machine, but I doubt if I will ever own another one. The whole time I had it, I was afraid of it breaking and I wouldn't be able to fix it.
These machines come up for sale from time to time, but the older ones are only worth $400 at best. You will see a lot of sellers boasting how they have one in "like new" condition or "near mint." Well, yeah. Almost all of them out there are like that because they were prone to failure on route backin the day and they weren't repaired, so they sat and collected dust.
Gottlieb did introduce a few in the late 1980's that are worth more money, but it's still the same concept.
IMO, they're neat to own once but that's about it. Parts for the older machines are too darn difficult to locate, so if something breaks, you might be stuck with a non-working machine for awhile. If it's the boards that needs work, thankfully there's John's Jukes in Canada for repairs.