Correct. Some of these subscriptions are commercial/professional release only, cannot get them as an end user. I still prefer the FSM and printed volumes of Chilton's or Haynes manuals. Those repair manuals get you most of the way through a repair - whatever information you are missing can usually be filled in by quick web search.
As for ALLDATA reviews - I believe there was a poster on here that used ALLDATA, but don't remember which poster - it was some time ago. On some other forums, some have mentioned Identifix as a possible solution, but I think it is mid-range priced - something like $120-$160 year. But it did have snippets of the FSM with the service. Might not get the whole FSM, but you get a decent amount to start with.
Also keep in mind there are different 'levels' within those services. Example, shops will have access to Motor ALLDATA that end users will not see on their version of DIY ALLDATA. Same with Mitchell - the end user Mitchell, I've heard, is a nightmare to use (like a convoluted search engine) - but if you see the Shop Setup PRO variant. Mitchell now, since being acquired by Snap-On, is hit or miss. Some love it - some hate it.
Identifix and Snap-On's ShopKey/ShopKeyPro are other services that some people said they liked. Identifix may not be as in-depth as ALLDATA or Mitchell, but some like its "direct-hit" feature of targeting a known issue with known fixes. I'll add a caveat that with not all fixes are correct, as some have found out the hard (expensive) way.
Not sure you can even get a subscription to the professional variation of ALLDATA, just the DIY version which is limited to a single vehicle only. Additional vehicles are up-charged on a per vehicle cost on the subscription.
All that said, ALLDATA is probably the best value out of the bunch. The others can be very pricy - some are hundreds of dollars per month! Unfortunately, the really sad part is that no single subscription is a perfect solution. ALLDATA might have 80% of what you need, but you might have to go to a FSM and Mitchell to get the other 20%. Mitchell is known to have great wiring diagrams, but the rest can be hard to use.
And to confuse you even more, another way of looking at it - you could spend just $20-$25 on a Chilton's manual and get about 90% of the coverage of any of those base services. There are some things on the car, that people shouldn't attempt to DIY - most of those are not covered in these sort of DIY repair manuals. So looking at it from this perspective, hard to beat the cost of a Chilton's or Haynes repair manual.