Life fitness exercise bikes are typically built as upright and recumbent, so if you prefer one style you can usually purchase it in the same model.
In terms of warranty Life Fitness typically give lifetime warranty on the exercise bike frame and 3 year parts and labour (however this depends on the Life Fitness model).
Typical Life Fitness bike models are heart rate controlled which means they have sensors on the handles that measure your heart rate (similar to some Life Fitness Cross Trainers)
Also you get great program features, such as hill climbs, and random workouts, fat burns (the typical programs you see in the gym)
Average Price Range - £500 to £6,000