I've only had it at pony club. My main problem with it is that the older conversions where they simply stuck boxes in a barn are very dark and lacking in air circulation. I would only have a horse on the newer ones where they have windows open to the outside at the back of their stables and a decent flow of air through the barn doors.
If the aisle was very wide I would probably tie in it, but it would depend on what the yard rules were.
We have internal stables. Love it! Thank fully our stables ventilate well! Due to Spock breathing he gets tied up outside his stable, or put in the spare stable if I am mucking out/bedding down. If I am riding when he has just been brought in from the field he gets tied up outside a friends stable on the outside block.
Oh yes it's great! Ours has good ventilation and loads of tie up space along the middle rail. We have our tack room in their with electricity so when the weather is bad you can still potter about inside and muck out, groom, and also clip. I have my box if things right outside Zebs stable, it's perfect. I'll pop some photos up if you like x
mine is an old cattle barn, but has a really high roof & is really light & airy.
We tie up outside with no problems at all. Only thing i will say though i make sure the horse opposite doesn't kick/bite. At my current yard both sides can tie up outside at same time & still have room to walk between the two. My previous yard though when a horse was tied up outside, they would be virtually touching the opposite stable so biting was common as was kicking if both were tied up.