The main reason a trimmer's performance goes down over time is that fine hair particles get accumulated inside the blade compartment and hinder the smooth functioning of the trimmer. in er206 kk (same as er206) the blade config. comes off very easily and can be manually cleaned and maintained. If u regularly clean and oil the blades, this device will run for ages. Pros - both cord and cordless operation - compact - floating blades offers smooth and accurate trimming - really simple way to manually clean and oil the blades Cons - nothing in particular ... great value for money recommended over Philips QT4019 and Remington MB200C