It would be over-kill, but it's basically a life-time purchase that will be overkill for most things you throw at it. Though personally I would not look at that tripod, I'd look at a bigger base one. At this price point, you might as well spend $1k and get an end-game forever setup. [IMAGE'S LINK: https://flic.kr/p/qDCS5b]IMG_1936
That said, I for one like to keep it within reason. I've used bigger stuff and found it was great, but maybe over-priced for what it was doing with my light weight kit (1D series, 600mm like yours, etc).
Here's what I did for the budget, but really good, approach:
Benro A2970F Tripod.
It was $150 when I got it. Really sturdy. Takes the weight. Tall enough for me and my uses. Allows me to do a big heavy load. Allows me to do delicate setups at close range for water landscapes, macro, etc. Discontinued now. But there are lots of equivalents in this range, like what you already posted. It handled my short lenses, all weights, for long exposure while in moving water, and I was able to get several minutes of vibration free exposures. Really sturdy and durable tripod for the cost. I wanted a versatile tripod for landscape in the water, weird positions, macro, etc, and also to be able to handle a long lens with a gimbal. I don't want several sets of legs. So I wanted it to be enough beef to take all that, but still as light as I could go without hurting that versatility and without breaking the bank on lighter materials and bigger names.
Here's an alternative beast that I would consider if you want a big platformer: Induro GIT204. Overkill for the light weight 150-600, but if you ever get something heavier in the future, it will do it with room to spare.
Opteka GH1 Gimbal.
$99 these days new. Several rebrands exist under other names, so shop around, save a buck. Before springing on a $400+ gimbal, I figured I'd test the waters on the Chinese copies. So after a lot of research I went and got the Gh1 on Amazon. I figured, if nothing else, it's not expensive and I can always return it. I picked it up. First thing I did was greased it by taking all the nuts/bolts/etc out, to get some proper lubrication in there (you never know how long things sit and in what conditions). Tightened it all up. Put it on the tripod. Mounted my heaviest setup with longest focal length (600mm) and went to panning birds in the wind. It handled really well! Smooth was butter. Was such a good experience for the cost, that I kept it. I still use it. I didn't bother spending on the $400+ one. This did the job. Maybe I would think differently, if I had a heavier lens. But for my 150-600 and 1D, it handles it no problem. I think if I had a 500 F4 or heavier (F2.8 supers), then maybe I would have felt the need for a beefier gimbal. But for the light weight 150-600's, the GH1 did it with flying colors.
Alternative, look at Manfroto's 393 at $180. It's great.
Here's my cheap Benro & Opteka ($250 total for this setup):
by Martin Wise
, on Flickr [IMAGE'S LINK: https://flic.kr/p/CrYuY1]225H8010
by Martin Wise
, on Flickr