SEIO's for $20

[Viggen]

I just stopped by Jacks to see if they had anything left & the SEIO pumps are all on sale for $20 ea.  I purchased two of the M2600's & two M1100's for each of my tanks.  I wanted a pair of vortec M60's but I obviously couldn't pass up the $20 ea sale. 

If anyone is interested in them they have the M640 & M840 or whatever their models are. 

Has anyone used these in the past?  I see they offer a flow timer & also a magnet to hold these vs the suction cups it presently uses.  Wondering if I should order them somewhere or just stick with the pumps the way they come?