I like to compare square tiles to irregular shaped systems (it's an odd hobby, I know). The solution here is the use of a terrain background poster over which are arranged the abundantly detailed trench segments. Suitable for contemporary and post-apocalyptic play. The versatility of these tiles means that they have a high reusuability value - and are ideal for wargamers and RPGers alike, which makes the current price of $5.50 good value - especially when compared to preprint floor plan products.
-Billiam B. (bit.ly/rpgblog)