No, I'm saying that every manufacturer is selective about WHICH POI are included due to memory constraints. The POI selection for your 540 is necessarily limited due to its memory size (half that of your 1535), and you just don't happen to like the set they selected. Given your example, guess I can't blame you. But there's a reason why your 1535 will give better results .. it has a MUCH larger POI set than your 540. Since I don't own your Nextel, I can't say what the mix of POI is that was used for that one .. I don't even know how much memory it has.
Frankly, I'm astounded that you have a 'Nextel' GPS. I've never heard of that. However, having worked with Nextel (RIP - curse you, Sprint!) for some years, I would understand if you're referring to mapping software with POI set on a Nextel cell phone? If so, you do understand that it goes out to the network (much like a current smart phone or TomTom Live unit) to get that information, right?