Has anyone used the Sigma 18-300mm lens?

I recently purchased the d5500 and the kit lens that came with it just isn't doing it for me, I need an all around good travel lens and the sigma 18-300mm looks good enough. Has anyone used this lens? Is it worth the $500 price tag? Would the 18-250mm be better at $150 cheaper?
18-300 http://www.amazon.com/Sigma-18-300mm-F3-5-6-3-Macro-Cameras/dp/B00NJ9K52W/ref=sr_1_3?ie=UTF8&qid=1458358649&sr=8-3&keywords=18-300
18-250 http://www.amazon.com/Sigma-18-250mm-f3-5-6-3-Digital-Cameras/dp/B008B4893M/ref=pd_sim_sbs_421_6?ie=UTF8&dpID=51uWpxqV73L&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1C59YNMGQ0R27YQYPQ29

go with the tamron. it is a better lens overall. 16-300 i believe. built better, weather sealed. better lens. around the same pricing too i believe. only down side is that focus can take some time. not too noticiable though. not an action lens by any means. but then again you can always use it manually.

i use the macro mode alot and for a lense at this price the corrections needed are minimal. i usually leave the photos stock.

also worth noting. the lens has less warp than the sigma. it is very slight. almost not noticeable. the sigma however needs correction as you can see where the straight lines start to bend. can be corrected but it wont work when you take photos at odd angles along the y axis(vertical)

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Keep in mind that your camera has a crop sensor. So you have to figure your 18-300 lens actually works out 28-450. 450 is a huge lens. If i could suggest something closer 70-200 tamron, you can get them used on ebay all day for less than 100 dollars. Take the rest of you money and buy a couple of primes. or a 18-70 which works out closer to 28-105, which in my opinion is a perfect walk around lens.