I purchased my copy of Vectron in a store in central Munich where customers were allowed to have a go at games prior to buying them.
With no review in the back of my head I was amazed by the fast vector graphics accompanied by huge sprites of guardians, bullets and the "Master Control Program".
It is a Tron-ish game with a frentic pace.
Don't be put off by the difficulty level. You will soon master the challenges and the innovative maze map you can blend in at any time really helps a lot.
The shop I bought my copy in was rather noisy so I didn't even hear the excellent Beeper-music on the title screen. I have never heared such a good tune on the Spectrum with 48kB.
So if Tron, vector graphics, frentic gameplay and adrenaline kicks are your cup of tea then face the challenge of this game.
And beleive me - the following mazes of higher levels just get even more demanding :-)