I bought into the NEX system as a middle camera in between my A550 and an ultracompact...only after the NEX system fixed itself up with the firmware changes. When it first came out, I seriously disliked the interface and controls, and wasn't interested. But with the updates and newer versions, they've completely transformed and after checking out some other mirrorless options, the NEX stood out as the best choice.
For me, the NEX is an ideal compliment to the Alpha - it can't do everything the DSLR can do, but can do a few things the Alpha can't...and being much smaller and lighter, it can either travel alongside the DSLR or take its place when you want to travel a little lighter but without losing the image quality.
I could not live without a DSLR, so a NEX system still isn't something that could take the place of my DSLR - some types of shooting, such as wildlife and action, just aren't competitive with what a DSLR can do. But I have found the NEX to be an excellent companion when wanting to travel lighter, such as business trips, or casual unplanned days - it can ride along in the car cupholder for random or spontaneous shooting, yet still give you full APS-C quality and capability.
At the same time, the NEX has its own perks that carve it its own niche - in particular, the pure joy of reconnecting to traditional, old style photography. Set up the controls the right way, and the camera body gives you control over shutter speed and ISO, while a good old manual lens via adapter gives you control over aperture and focus, all manually. It's lots of fun discovering old lenses and superb bargains, and taking time to do a different type of photography than my usual - slow, taking time, setting up shots manually...like film days.
My NEX often travels along with my DSLR to the wetlands when I'm birding - it can sometimes take a bird snap when they're really close, or let me shoot a landscape or flower closeup scenic type shot without having to swap lenses and take off my big birding lens. For me, this is a much better second body alternative because it's light enough to hang around my neck or in a small belt pouch. And my NEX has gone in place of the DSLR, such as a business trip where I needed to travel light in a carryon bag, but had an extra day to spend in Disney World before my business - I was able to take everything I could with the DSLR with something no bigger than my old superzoom - even the handheld ISO6400 stuff and indoor dark stage show shots, that couldn't be done with a P&S.
I'd say go for it - I have become so secure with the decision to buy into the NEX as a middle system, that I'm already considering not only my next DSLR upgrade, but also my next NEX upgrade - mine's only 6 months old, but it's already a definite part of my camera arsenal, with its own collection of 14 lenses built up, and new update bodies are now a fact of the future for me!
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Justin
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