I have no dislikes for the TecMate OptiMate 4. I have had this before but unfortunately it got damaged when moving home. It has been used on my Triumph 1200 Tiger and also the Honda CRF300 which had been sitting for 6 months with a tracker which totally discharged the battery. On plugging in the OptiMate it took nearly 2 days (which was exactly what the manual said it would for a fully depleted battery) to fully restore the battery so all I need to do now is keep it plugged in to trickle charge and condition the battery for future use. Fully recommend the OptiMate brand