Hello,
i was i n the same situation like you, but i decided to buy a new update.A new Maxisys is the double and here in Sweden i get my support if something is wrong.Of course, there are many out for a cheap price, but use your you have right now, or is it wrong?
After the updates i get i was really impressed, what the have changed until 2015.They doing their job as well.Benz till exempel i can do much more as before and what i heard, on BMW they are the ruler....
Decide yourself, but the update is much money i agree, but you will be glad.
Only your old Maxisys is bad in battery or something else.But my is like new , so there was no thinking about a new (or other) one.
Greetings Mathias