The Eagle is a good Pitts substitute if you are not into hard aeros and the front seat is much more spacious. It is also an LAA permit aircraft so cheaper to run. The Pitts S2As are almost all certified so more expensive to maintain.
The Eagle is a very good alternative to the YAK.
The YAK is a great aircraft but fuel consumption is a killer, hence the low prices.
None of these is a patch on a good monoplane though!!!!
ZA