I like how this is very easy to use for both myself as well my subcontractors that are working under me at time of construction site work! It makes it easier than writing out instructions each day which can be difficult when there's so many people involved during such an important process (construction).
Nothing really bad about J-Five but maybe if you have multiple users would want more options or features added because right now its pretty basic/basic tools they provide only -.- The ease factor alone helps make up mostly everything else though :) Just using them everyday has made our jobs much simpler especially knowing we dont need paper written plans anymore!!