Pizza Planet was actualy the first place I ate in DLP back in 2001, we arrived around lunch time and went in.
Things might have changed over the last 4 years but I thought it was awful, there's no windows, it was very smokey (from all the people smoking) and it just looked like it needed a complete update.
It's been shut everytime I've been since but to be honest I don't think I'll ever venture in there again.
Sorry to be negative
Cheers