Finished it yesterday - 42 hours, with everything apart from a couple of companion quests and some bugged quests completed. On the whole I thoroughly enjoyed it.
Some non-spoilery thoughts. First, I think it is fair to compare it to BG as it's obviously very closely modelled around it, and in that respect it works extremely well. It might not be BG3 but it feels like a new BG game, and that's what counts. The conversations and plot take more cues from Planescape: Torment, which is great. The story and history of the world are interesting and detailed, the characters within it are well-written. The combat is challenging and complex, if not as innovative as Divinity: Original Sin. As a first-class RPG it ticks all the boxes.
I didn't get bored at any point, and after finishing the game I disagree that the choices aren't meaningful, as my choices right up until the end had massive consequences in terms of the story. The issues for me were a lack of legendary loot items and the mostly pointless stronghold upgrades. Why is it that every single amazing weapon that I found was a bloody estoc? I don't want an estoc. Nobody in my party is trained with estocs. What the fuck is the difference between a great sword and an estoc anyway? And RPG rule one of allowing you to pay for better merchant options is that they should have something - even one item - worth buying. I've ransacked countless dungeons; I'm so rich I can afford to restore a pile of rubble into the finest keep in the country. So why on earth would I want to trek back to my stronghold to buy a crappy sword that I can buy at literally every other smithy in the world? These are two issues which can hopefully be improved by mods.
As for the homogeneity of it... I'll leave judgement on that until a second run through it. It was specifically designed to be inclusive rather than restrictive in what characters can use and do, so it's kind of intentionally homogeneous. My instinct says that it's a good thing - I like being able to give my chanter a gun rather than a wand - but it could all blend into one after a few goes. I still haven't used half the classes, including the cipher which has had a lot of praise, so there's still plenty left to explore. The chanter is a weird class, and I'm not sure I'd use one again as I found myself using the shortest chants so I could summon stuff quicker. I daresay if you spend a bit of time putting together complex chants then you can cause some interesting effects, but frankly I couldn't be bothered. I found the most useful class was the fighter, because for all the fine intricacies and complexities of the other classes, most fights just needed a tank to wade in and keep things busy. Eder took a hell of a beating.
Special mention has to go to the stronghold dungeon. I spent maybe 10 hours or more in there, and they were a brilliant 10 hours. Spoilers for those who haven't got to the bottom:
That was a bastard of a fight with the Master. I couldn't bring myself to free her, so I went back with my party at level 11 and brought the ruckus. The loot wasn't anything to write home about, but the satisfaction of managing to defeat her after being killed in two hits earlier was good.
Pillars was more or less exactly what I'd hoped it would be - a very well made RPG in the style of BG. I really enjoyed Divinity and Wasteland 2 last year, but given a choice between the three games I'd choose Pillars every day of the week and twice on Sunday. A triumph of a game.