I've been using 'Avare' for Android the last several weeks. You can download any sectional, chart you want and I've been happy with the GPS tracking and moving map. For the VFR flying of my RV it is more than sufficient and best of all it is free! It doesn't have a lot of bells and whistles but it does have extended runway center-lines.
I have trialled Naviator and one other but I have
settled on Avare for now. One reason. ITS FREE.
The others are probably better but I'm just too cheap.
Every chart and plate I am interested in is available. They are georeferenced.
AF/D included. If connected to WIFI internet, you can get weather at a reporting airport by holding your finger on it.
The documentation for Avare is absolutely horrible. I struggled with it at first, but now that I am used to it and know how to do what I want, I find it quite handy. Been actively using it for 6+ months on a Samsung 7" tablet. I have not been able to do a multiple point flight plan yet. There are a few words about it in the meager documentation but I have not been successful yet. Its not a show stopper by any means. Changing destination is easy.
**EDIT Aug 13, 2013 ** I just updated Avare from 4.1.1 to 4.2.1 (10 revisions). The help file says how to do multi-point flight plans and it works.
I think I am going to uninstall all the other aviation apps that I had in test mode (now expired) and keep going with this one.
So, I'm happy. Getting much better at the paperless EFB. The Samsung is OK for sunlight. Probably same as the rest of the non-aviation tablets. I have to shade it with the canopy shade sometimes. But what I have come to realize is that the only time I am REALLY interested in it is when the weather is crappy. The sun ain't out then anyway.
The Samsung charges with no problem from the 12v car jack. Seems like there was a thread about IPads or something not charging right.
I have tried to give the AOPA FlyQ a benefit of the doubt but the PC version is terrible. It is abysmally slow to update and is extremely quirky to do things not commanded. It does integrate with the free android version but the portable version is so castrated for capability (no map) it is pretty much useless.
** EDIT** I saw evidence of FlyQ map on a portable screen recently . I'll dig a little more. Maybe my problem is operator error.