Ive used rui's clen and albuterol. I havent used their clen for a few years because I dont use clen anymore. I have now switched to albuterol. Its shorter half life makes the sides WAY more manageable. I really like albut and use it even just as a preworkout at times - its great stuff. Both products from rui are to quality man, cant go wrong with either one IMO.
Do yourself a favor and ick u some ketotifen as well. This will enable you to not do a 2week on/2 week off routine with either clen or albut. It keeps b2 receptors up-regulated so you can stay on steadily, without breaks. Its worth the like $20 it cost fir sure.