I've recently started sporting a goatee for the first time since I was 18 when I tried it out but could never get the precise straight lines. Needless to say, the straight razor makes this very easy for me and it has perfect lines. However, it is not easy to cut with scissors and I want uniform length.

There are lots of products on the market I know, but can anyone recommend a cheap one that does the trick well?

Many thanks in advance