I use an MTC Viper and find it fantastic. Mine blurs slightly at 45 and sub 15 but I like it as I use this to range find, but if you like a clear scope through the whole range then it might not be for you. I used to have a Tac 30 but suffered dreadful parralax at sub 30 yard targets. The Viper for me has been great value for money at around £140 if you shop arround or you can get one of their higher end models second hand. Again this is purely opinion and Im sure someone will have a completly oposite view. Hope this helps a bit.
Steyr 110 with Leup VX3
Ripley AR5s with MTC viper
Walther LG300 XT Protouch with EB Sniper.
for Kibworth HFT news and results
for the latest Daystate Midland Hunter Series News