cheap enough for people to buy or pay for it
affordable
having new ideas, opinions, or ways of living long before most other people do
ahead of its time
able to be used together
compatible
old-fashioned in your ideas or methods/ outdated
behind the times
the disadvantages
cons
an aircraft without a pilot, controlled by someone on the ground
drone
using new ideas, ways of doing something
innovative
the advantages
pros
something that proven in the past to be reliable and successful
tried and tested
to start using a new and better version of a machine, system, etc.
upgrade
based on new ideas to find out about something
experimental
used to replace a broken part of something
spare part
