singlespeeds rule for commuting and in general for us slobs who ride bikes way more than fix them.... i ride my singlespeeded crosscheck or fixed gear 15 miles to philly daily. it is amazing what you can ride on a singlespeed with the right gear ratio, fitness, and frame of mind!
i feel the mechanical advantege is definitely there; without haning to run your chain through all them damn pullies, and constantly having perfect chainline. plus it feels good to just have smooth consistant smooth power input.
hills are very possible if you work your way up to them! if your commute has hills, your gear ratio will always be a comprimise between ease of climbing and speed on flats/downhills.
i really like redline's! had a moncog for two seasons off-road and never had any issues (only gave it up for a custom built singlespeed). some peoeple say the redline hubs aren't so nice but mine held up beautifully. good bikes, cheap prices... i bet you'll love it!
whats your gear ratio? you riding fixed or free? welcome to the club (we'll show you the handshake soon)....