
I do not have personal experience with Penn Plax, but came up with a web page that broke down the internal parts of their canister filters.
http://www.pennplax.com go to page 19 of the catalog.
The canister filter I have and like is an Eheim 2028....the Eheim site has a chart to help you compare.
http://eheim.com/Images/chart.jpg
There are several factors to research when choosing a filter.
Reliability and life of service should be considered because no matter how in expensive a product is, if it doesn't give years of good service it is money thrown away....
#1 in importance after reliability is FILTER MEDIA CAPASITY.....
both the brands measure the capacity of media baskets....the smallest Eheim is 3 L the Pennplax is 1 L for the 700....This tells me the Eheim will carry 3 X as much bacterial colonization on media surface!
Both brands use floss and sponges, they are good and important.
The penn plax only has one small basket for bio media. This limits the kind of media you use...If you have bio-rings for example, you have to take that out if you need to use carbon to remove medications.
Eheim have several baskets - the 2028 has three. This allows you to customize what you are using for media....I use bio-rings, bio-balls, and peat.....If I need I'll take one basket (peat) out put carbon in, then change it out after 24 hours and refresh my peat.
When I was choosing my filter I researched two brands Fluval and Eheim...because both had good reviews on this site. They both have good reliability, tho Eheim seems to be the tops. They both have quiet operation but again Eheim seems to be the quietest.
Fluval is less expensive than Eheim and some of their filters have higher water turnover.......I did not compare these issues in the PennPlax.
As to whether you use your UGF....you can if you want to...I use them...Even on the 125 gallon tank that has a Eheim 2028 canister filter...The reason is I tend to "overkill" and want all the filtration/bio material I can squeeze in a space....But if you don't like the tubes, or feel you want to follow the current trend away from UGF feel free...Just seems like if you have it and it isn't broken, you can always add more filtration at your convenience..
