Based on this thread, we ordered a delivery from Dil's on Saturday night and it was fine. Delivered in good time and good food. Not my favourite local Indian but my favourite doesn't deliver and Dils Delivery was considered better than driving to our preferred restaurant.
I'm a Dil's regular. Mainly for takeaway and so when on a night out for a curry my mates often think their curry house is best and I'm prepared to give them a go. Each and every time I've tried a different place in Hertford it doesn't compare to Dil's. Great fresh food and nice waiters.
The only downside I think is the decor. It's a bit bright and orange. A bit more of a traditional Indian decor would be nice. But, I put food above everything else which is why I'll always prefer Dil's to others.