Since finding out about it via this forum, it is now my goto planning tool. Tried the free version, which in of itself is good, but the gold is definitely worth up-grading. They don't make the free unusable or riddled with ads, but you can appreciate that paying gives you features which can help you (but you may not need) and I like that.
The only ting that bothers me is the 'pay once, get if free for life' - because very rarely is that kind of model sustainable. At some point, something will change - the ONLY time this has worked for me (currently) is using a media service called 'plex [edit] - and a server service called 'unraid'', many others I have paid for 'lifetime' use have failed or changed their model.
You pay your money and you take your chances!