I go quite often. Last time I went on my own I used the train via Crewe. I felt fine at Birmingham New Street queueing on the platform with my bags full of plants, felt a bit silly by the time I got off at Crewe....
I've found it to be a good one to take my elderly mum to as a lot is indoor and there's lots of opportunities to sit down and have a cuppa. The indoor lights do make it a bit odd at the indoor plant stalls as they are a funny colour.
It is well organised ( although parking is £7 extra) if pricey. I don't find the plants cheaper than local nurseries any more, when they first started it was a great place for bargains.
Best to go as early in the week as you can as the exhibits are at their best and the suppliers have plenty stocks.
If you fancy a bit of TV gardening celeb spotting, it's a good opportunity. I've seen Alan T, Monty, Chris B ( small but perfectly formed) Pippa & Carol over the years.
I enjoy the outing as an event and an opportunity to look at lots of things I'd never buy and enjoy the show gardens and plant displays.