The 18-135 is a pretty good all around lens.
WR is a bonus, it focuses quietly and reasonably quickly, and at least compared to the kit 18-55 = < some other lens >, can make a huge difference as a walkaround single lens, vs needing to swap often with the 18-55 and 70-210, 70-300, 28-70 or others.
It's not fast, and I'd love it were it a constant f/4, but we were able to do a 500-1k picture weekend trip from sunup to dusk in a range of conditions (inside, outdoors city/closeups, outdoors nature/further out, outdoor portraits, etc.) without missing other lenses for > 90% of the shots. I did some crops as in some cases the 135mm just wasn't long enough, with satisfactory (to me) results. Likewise as the sun went down, I would up sticking to the shorted end of the range to keep the aperture larger, before finally swapping out for a 50/1.7 as it hit full dark.
Size-wise, it's also quite convenient, only a bit longer than the 18-55 kit lens, although obviously longer when zoomed, and definitely a more solid/hefty lens overall.
I do think it's overpriced a bit, but if you consider price difference of Adorama (bought mine from B&H but they never credited PF for the sale, so looks like no more B&H for me :-/ ) and most used prices, you're rarely seeing more than a $50 difference, so unless a stellar deal pops up, I'd just buy this one new.
I am interested in seeing when the new DA* comes out, as I think there was something like an 18-90 but not until 2013. I'm not sure it would work as a direct replacement, although it likely could replace a Tamron/Sigma 28/24-75 nicely.
If you can forego the WR and range, a Tamron 28-75/2.8 might be worth looking at, but right now, I'm intending to pick up the Tamron and have it be an addition vs replacement, with the Tamron used more for low light, portraits and indoor stills, while keeping the 18-135 as a more general purpose walkaround.
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