The last time I went to MOSI was during its refit and as a result I didn't get to see the full raft of changes to the site that have been made since. There's still a dearth of in-depth signage, but the museum itself does an excellent job of bringing its exhibits to new audiences. It struggles in one sense from being split over 5 buildings, but I know that places like Thinktank in Birmingham would be more than happy with the extra space that this gives.
The main thing that interested me was the planetarium, which was useful as I was there partly to give presentations to the public throughout the evening for their Lunar Eclipse Event. As it happened the Moon was already going to rise fully eclipsed, and from there was also fully obscured by that famous Manchester cloud. The live link up from Dubai (and then Israel) provided the British audience with a real-time focus for the night.
The planetarium itself is quite small, seating 30, and with an old analogue system imported from Edinburgh years previously. It all still works (despite two stars in Ursa Major being stretched out making it less like a Plough (or Big Dipper) and more like a frying pan) and produces a wonderful effect, especially with its steampunk guidance system. It still has the mod-cons of computer projection for slides and video, but the core is very sweet.
The museum is a great place to visit and the planetarium well worth a look. As the rain came down the roof of the Air and Space Hall (where I was based) did begin to leak, but it show how cuts to funding have effects all across the board.