I adore this top coat - I've been using it for years, and it is amazing at making cheap nail polish look super expensive! It has an amazing shine factor to it, and it doesn't suffer from chipping or that 'peeling' feeling you can get from other top coats.
The bottle is the typical OPI bottle shape, designed to easily get to the polish (even when you're starting to hit the bottom of the bottle). The brush is a nice size - I can usually get my nail covered in two dips into the polish. If there was a negative to be found with this polish, I do notice that the top gets a bit crusty after a while - but this is a small thing.
I'm a big fan of OPI as a brand, but if I was told I could only buy one OPI product for the rest of my life, this would definitely be the product. It's very effective at sealing the nail polish and keeping it on.
Oh i am a huge OPI fan, maybe even a little bias as all i have is OPI. I went for ages without worrying about a top coat as i thought just the colour outlasted all other brands i have tried. But there was a farmers special where you got this free with a colour. It does make it lovely and shiny and makes it last sooo long. I havnt looked back and use this every time.
Tips: Store your polish in the fridge door to help with smoother application and longer shelf life