I've owned iPad2 since day one and waiting for the iPad Mini with cellular as its replacement. Going to a smaller form factor for the weight reduction in mobility.
I don't have any issues with my iPad2 at all. I'm fine with the screen size, the non-retina display, its weight, speed and memory. Apart from browsing internet, I do a lot of reading, ebooks, epup and also PDFs. I also do a lot of PDF annotations and signing. I do some occasion gaming (racing and puzzles) and all are running fine without noticeable speed issues (latest racing game Asphalt 7 runs smooth). Some video watching from internet and also streaming from PLEX installed on my Mac Mini from my living room. All of these run perfectly fine on iPad2. I have many uses for my iPad2 and since iPad Mini has the same specs, I'm pretty sure I can do all of the above on a smaller form factor.
I welcome the new camera specs on the mini which is a huge upgrade IMO. Now FT should be a lot clearer for my parents and sister back home in Canada. The only thing I may miss is the normal iPad screen size for drawing and painting which I totally gave up doing on my iPhone 4s after a few attempts on a small screen. But it's not often I have time to draw or paint so not a big issue. Lets see.
I don't know why so many people are knocking on the mini due to the non-retina display or slower processor. Apple's reason to continue selling the iPad2 only means that its spec will be supported for a while. If surfing the internet, viewing videos, emails, photos and casual gaming is all you do, the current spec will last a long time. You only need a faster CPU and larger memory if the content significantly changes or whatever you are doing outpaces the tech.
BTW, I'm almost 40 and I had just spent some time during lunch reading an entire 60 page MSA in PDF on my colleague's iPad mini (received this morning) does not give me headaches. LOL