Hi,
Well I can answer that question in two ways. Worth it for performance, and second worth it for value.
Anything over Max 2015 onward will be a significant improvement in performance compared Max 2011.
I still have Max 2013 installed, and when working on very high detailed meshes there are often slight delays or lag, when making changes like adding turbosmooth, or making adjustment in sub object mode etc, but the same changes in max 2017 are instant, and you can throw very high detail meshes around the viewport with ease. There are also a number of workflow improvements and tools that have been added since Max 2011.
There are also major improvements to Iray, and the new Art renderer, which both give very fast realistic results depending on your hardware specifications, plus improvements and more options for lighting and camera's.
But as for value, that's a little more complicated due to the changes Autodesk have made in recent years on how you can purchase 3ds Max.
As you are a hobbyist, I am guessing you do not currently earn an income from your CG work? Or do you plan to?
You can no longer purchase perpetual licences from Autodesk, start a new maintenance subscription, or upgrade from an old version. Its desktop subscription only now, which is basically renting per month or per year.
As you have not continued with a maintenance subscription, your only choice now is to rent, so you have to consider whether or not its worth paying £204 a month, or ££1,644 a year to be able to use Max 2017 onward. Autodesk are doing a promotion where you can trade in your serial number and get 50% off a 3 year rental licence, but I don't know how far back this offer extends as far as the version of Max you can trade in.
The other thing you have to remember is that once that 3 years is up, you will be paying £1,644+ a year for minor performance improvements, service packs and hot fixes. So for hobbyists, freelancers, and small studio's, it may seem like you are not getting a great deal, and not getting £1,644 worth of improvements each year.
Autodesk already pushed up maintenance subscription prices 30% over last year, so the small improvements to Max each year we are seeing don't justify the price hike IMO. With Autodesk laying off development teams, passing on those applications to remaining teams, which ends up with very little to no development, and slowing showing their resellers the door, by streamlining operations to online rental only, those savings should be being passed down to the customer, but instead we are seeing huge price hikes. if they expect maintenance subscription members to pay twice the price for rental in a few years , when MS members are already unhappy with current prices, they will end up seeing a mass migration from freelances and small studios to another brands instead.
I started a forum post a while back regarding Autodesk's recent changes, basically giving everyone only one choice, that only suits the big studios, not hobbyists, small studios and freelancers like myself. I don't think it went down too well with Autodesk, but I have received a lot of feedback from them. Whether or not those concerns will lead to any changes in the future, who knows, but I wont be holding my breath.
http://forums.autodesk.com/t5/3ds-max-forum/crazy-subscription-charges/m-p/6610165#M123931
If you are wanting to make CG work a primary income in the future, Autodesk are asking a lot for start-ups and hobbyists to bite off of their monthly income per licence.
Myself and I am sure quite a few others would love Autodesk to bring back perpetual licences, and upgrade packages, and stop these ridiculous price hikes in maintenance subscription, but its doubtful it will happen. But if Autodesk only cater for the large studios in the future with rental only plans, future start-ups and freelancers will choose the more affordable software suits from other bands, and base their future pipelines on non Autodesk products.
If you definitely feel you can make a minimum of £204+ a month out of your CG work, then go for it, but purely as a hobby, its going to end up an expensive one. Obviously if you want to have the latest hardware and get the benefits out of it, you will eventually have to upgrade your software, but as you can no longer save up and buy a permanent perpetual licence from Autodesk, you may be better off saving up and migrating to something like Cinema 4D. I know Autodesk will frown upon me for that suggestion, but if they remove choice for their customers, the only other option is to look elsewhere...
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