I’ve been running a FlashForge Creator Pro for over 5 years now and have been super pleased with it. I haven’t had to replace anything aside from some TPU hoses to feed the filament in all this time, but the parts at least at the time were easy to obtain since the platform was shared by multiple manufacturers like qidi. I’ve done dual color prints maybe twice ever on it. I felt it wasted too much filament on the ooze wall and still has streaks, so instead I design my models to be different colored separate parts and either snap or glue together for a cleaner end product. I think the only real limitation it’s had is the small bed size. I’ve had to do a lot of multi part builds to make anything large.

What kind of filament are you using? I’ve had that trouble with ABS before and what worked for me was making a slurry of acetone and some scrap filament and painting it on the glass then adding a brim to the model in the slicer. With other filaments, it’s always been playing with the temps and using a brim in my experience.