Lens pens are a tried and tested product and the Hawke edition works well. This version has the advantage of being streamlined and fits in a coat pocket nicely. It works very well but don't expect miracles; sometimes for some marks/smudges you have to revert to lens cleaning solutions and cloths. I find 'ROR' (Residual Oil Remover) solution excellent for the purpose when the lens pen can't do the job.