I'm also using the three a bought as back up to my OEM BLN-1 battery for my EM-1 and HLD-7. Life time may be a little shorter but as the previous reviewer said they are significantly cheaper than the OEM battery. I've no hesitation in recommending.
And I'm glad I did. Yes it is paired back feature wise but it does include free map updates and the excellent TomTom live traffic. Routing is generally very good indeed, a bit of a step up from my previous Garmin and my TomTom before that. I like the new interface although some of the icons could do with increasing in size to make more of the screen real-estate. Satellite fix is acquired quickly. All in all a very good job TomTom and with on-going software development I can only see things getting better. Highly recommended! In terms of star rating I would have given it a four and a half (90%) but as that isn't an option it got the full five.