I bought a Henry Big Boy .45 Colt a few years ago, my first experience with Henry rifles, and I'll tell you what I've learned...
First impressions out of the box were that the rifle was absolutely beautiful, the brass receiver combined with the blued octagonal barrel with the gold color rollmarks and American walnut stocks really makes these rifles standout.
The action was so smooth and perfect I was shocked. Previously my only lever gun was my Winchester 94, which is a great gun, but doesn't hold a candle to the action of the Henry. It really is perfect.
The performance is absolutely amazing. The Henry Big Boy rifles aren't just a pretty face, they are extremely accurate. I was really amazed how accurate the rifle was just using iron sights. With optics, if someone chose to go that route, it would be phenomenal. It's simply an excellent rifle. My sister shot mine the first time and that was it, we had to go buy one for her, also in .45 Colt.
I've not had to deal with Henry's customer service just because our rifles have never had any problems but you can look anywhere to find folks who have dealt with their CS and give them excellent ratings. Their customer service, like their rifles, are top notch. Absolutely no worries there.
Now, I've heard folks complain about no side loading feature but from someone who owns and shoots a Winchester 94 with a side load I have used both many times. The side load feature is a huge advantage when in a battle where topping off the magazine on the fly is desperately needed. I've never had that issue so far and should some war break out on our home soil, there are far better gun choices anyway and my lever gun will be in the safe. The downfall of a side load in this day and time is that it's both hard on the thumb but primarily it's having to crank the lever every time to extract each round when you are done shooting. I hated having to work my Winchester over and over every time I was through shooting or done with the days hunt. It was rough of the cartridges and then since they go everywhere, you have to gather them up and clean them off to be used later. Some people say that it's not a valid complaint since you should just blast away to use up the remaining cartridges in the magazine but that just isn't a reasonable answer.
The Henry's tube load is fast and easy once you get used to it, which takes maybe one or two loadings, but more importantly it's way faster and easier to unload. No working the lever over and over then picking up the cartridges, just turn the tube magazines top, pull it out and pour the cartridges into wherever you want them to go. It's really a great solution for modern lever actions. Now if the only rifle I owned was a lever action and lived in a world where I was having to battle other people, I would absolutely choose a side loader but that's about it. I love both my lever guns, side load and tube load but the Henry's tube feed is definitely the easier to load and unload.