I have a 'chrome ears series' Soligor 300 5.5 and a Tair 300 4.5.
The Soligor is a bit smaller and lighter than the Tair ( but so is nearly every lens ever made !
) but the Soligor still isn't light.
Both are good lenses if you have got a Sherpa to carry your equipment, or like me you drive wherever you can.
I'm using the Soligor quite a bit at the moment because I've just scraped some paint of the T2 mount to get catch in focus with this lens which has opened up a whole new world of usability. I'm now getting shots hand held that I could never have got before.
As for the quality of the Soligor lens, I don't think it's bad at all. I like the colour rendition and the sharpness is very acceptable stopped down a bit, and even better on a tripod or monopod.
I haven't used the Tair as much as I'd like yet but I have had a few razor sharp images, with a good tripod and stopping down to mid range.
Both of these lenses were very cheap, neither cost me over £20 ( GBP ) $32 ( US.)
Have a look at my Flickr photostream and over the last few days you'll see some shots from the Soligor. There might be some from the Tair but they're buried deep in the old stuff.