How long do you guys usually go for? I usually run mine for 4 weeks on, 2 weeks off.

Heard it aint good to keep on it for a long time

Quote from David's article linked below:

Cycling - This is the idea of taking a week off of creatine every 8-12 weeks to allow natural production of creatine to return to normal levels. This is done because creatine consumption downregulates the creatine transporter, although levels quickly return to normal upon cessation of use (3). Whether or not cycling is beneficial is still up in the air, but it is definitely not necessary.

Downregulation of CreaT is rapid. Creatine uptake by muscle is pretty much self-regulating, so cycling is not going to help at all in raising levels past a certain point. I would go for continuous use.