While working with Ria OLAP Grid I regularly run into runtime error messages. Very often I have to reload the page, because the error messages won't go away.

It's my opinion that creating new features is by far of minor concern than ensuring the grid will run stably as is.

My vote is: Do a thorough quality testing with your developers, find possible bugs, and eradicate them. Rinse, repeat, until your software runs reliably.