Aloha Jim My box of glass is mostly TeleVue Plossels, a Celestron Ultima and a Meade 2" wideangle, not the tops in glass but they do a good job. I purchased a Siebert 5.4mm several months ago and it was only last week that I really got to see what it could do. WOW!! I needed a high magnification EP for viewing and didn't feel like spending $280 for a TV Nagler so I bought a $89 Seibert. First impressions: small, light weight, utilitarian construction -- hummmmm. Well last week on Mt.Haleakala at the 9900' level w/ a slightly hazy humid sky, I took a look at Jupiter (Vintage C8) as a test starting w/ my 26mm TV, to the 17mm TV, to the 10mm TV ( only works w/ good seeing) with cloud bands becoming more distinct, GRS visible to the Siebert 5.4 where cloud bands w/ interior details were seen. The EP was later placed into an 18" Starmaster, did REAL good there too! In my opinion if you want a nice eyepiece collection, you might consider checking out the Siebert site http://www.siebertoptics.com/ for some nice eyepieces worth the money. Have fun .............. Aloha from Maui Rob http://RobRatkowski.com